The air conditioning is a blessing, especially in hot temperatures. This setting only directs air to your face and upper body and not your feet. ChryslerMinivan.net is the best forum for Chrysler Town and Country owners to discuss mileage, price, problems, towing and more. In this video we show you How To Repair a Dodge Caravan Air Conditioning System. AC dont work on Dodge Caravan Check FUSE & Relay RB The Mechanic 59.2K subscribers Subscribe 44K views 2 years ago Due to factors beyond the control of RB The Mechanic, it cannot guarantee. A blown head gasket can cause the exhaust gases from the engine to enter the cooling system and plug the heater core. 2023 Vehicle History Inc. All Rights Reserved. When a blower motor goes bad, it usually makes unusual noises when in operation, and the passengers may feel reduced airflow from the air vents. Home Troubleshooting Dodge Grand Caravan AC not cooling causes and diagnosis. If too much dirt is caked in the blower fins, it can throw off the balance of the spinning cage and cause it to wobble. One is labelled H for high-pressure and the other one is labelled L for low-pressure. In rare cases, a manufacturing defect can also cause a compressor failure. The rear works fine, AC cycles on fine, but no matter what I can't get any air to come out of the front. By filling and properly bleeding the system the heat should come back. If you have front AC that is working fine then the rear should also work if the blower is working. Your vehicle may also consume more fuel than normal. This van has controls for the rear at Ask an Expert Car Questions Dodge Repair This answer was rated: Amedee, Dodge Technician 37,957 Satisfied Customers ASE certified tech advanced level specialist. This can have different causes. Like the radiator, the air conditioning condenser on Dodge Grand Caravan sits at the front of the vehicle and is responsible for releasing the heat from the refrigerant into the ambient air. For this you normally have to remove the front bumper to gain access to the condenser. Shake the canister briefly and release the refrigerant into the system until the recommended pressure has been achieved. 0%. If one fails the test, you get the blinking rear defroster.Problem is a bit deeper because if you replace the failed blend door actuators with replacement parts (such as Dorman), the new actuator will work, but still fail the self adjustment test. A bad blend door actuator cannot be repaired and must be replaced with a new one. Weak key fob battery. Check fan relay. You need a pro that specializes in AC systems to troubleshoot what the issues are. Rear AC not working Rear AC not working 2016 Dodge Grand Caravan Asked by Visitor in Englewood, CO on September 05, 2021 I had the AC unit replaced when I brought the van however, there is no AC blowing in the rear and my van doesn't have the rear controls, needing to see what is the issue as to why my AC isn't blowing in rear. Cleaning the evaporator in Grand Caravan is not a simple task. Find a better mechanic. The heater may stop working in Dodge Grand Caravan due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. Climate control module is the brain of the air-conditioning system in your Dodge Grand Caravan, responsible for controlling all the components in the system. The cabin air filter captures most of the dirt or other airborne particles, but some particles escape and can get lodged on to the evaporator. Christopher S July 30, 2020. Warning: Wear gloves and safety glasses before recharging the AC to avoid accidental exposure to harmful chemicals in the refrigerant. Since some OBD codes are manufacturer-specific, the scanner will be able to give you more accurate information if you enter more details about your Grand Caravan. Leak discovered. Where are the 3 buttons to hold for reset? It's fake /inaccurate, What high and low buttons? The manufacturer was not notified of the failure. There is no prescribed time for changing cabin air filter, but most manufacturers recommend a change after 10,000-20,000 miles. If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturers recommendation. If the temperature changes a little, the module may need calibration with the scan tool (StarScan, StarMobile, etc). First You will need to start the van and make sure the mode in the vehicle is set to panel. ! The most common symptom of faulty blend door actuator on Dodge Grand Caravan is a slight clicking sound repeatedly coming from under the dashboard. The inside of the vehicle is developing a bad moldy smell. Let us know what you find with this and we can go from there. The most common causes for AC not cooling properly in Dodge Grand Caravan are low or overcharged refrigerant, compressor malfunction, clogged cabin air filter, dirty condenser or evaporator coils, dirty or sluggish blower motor, and bad fuse or relay. Did you ever come across a Problem like this? Determine if the blend door is moving. If it stops permanently I'll pull the carpeted cover under the glove box and see if I can pull, clean, and lube the actuator. Your air conditioning system no longer cools properly? Although, the evaporator coil is a component of the cooling function of the air-conditioning system, but the air always first passes through the evaporator and then flows over the heater core. IMPORTANT COVID 19 SHIPPING NOTICE. My 2003 Dodge Grand caravan blows hot air and my friends that was looking under the hood said that the fans arent coming on, not sure what fans but what do I do. If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturers recommendation. year to help you gain confidence about one of your largest purchase decisions. Do you still sweat while driving your Dodge Grand Caravan? Just like with low refrigerant, the AC in Grand Caravan will blow warm air only if the AC system is overcharged with refrigerant. The vehicle was taken to all star Dodge Chrysler Jeep ram at 11503 st charles rock rd, bridgeton, mo 63044, (314) 291-2050 where it was diagnosed that the power control module needed to be replaced. 166. 92492 20+ yrs. Once the leak has been found, this must be closed again by replacing the respective component. Press the top button to complete the reset. The two most prominent symptoms of a clogged up evaporator in Grand Caravan are: the air flow from the AC vents is choppy and not smooth, and the inside of the vehicle is developing a bad moldy smell. If there is no air flow from the air vents in the dashboard when you turn on the heater in your Dodge Grand Caravan, it means the problem is related to the fan or blower motor function. It is a filter! Dodge Grand Caravan. The rear HVAC housing has electric stepper motors driving the temperature blend door (cool/warm) and the air mode door (side/headliner vents). The AC light should illuminate and then flash. Insufficient lubricant: The compressor in Grand Caravan needs lubrication to function properly and minimize mechanical wear by reducing friction. 0% 37 % of the time it's the AC Refrigerant Leak 0% 21 % of the time it's the Climate Control Electrical Issue 0% 12 % of the time it's the AC Compressor 0% 30 % of the time it's The minivan was first manufactured in 1983 and remains in production as of 2011. Very common problem & they were surprised there . Insufficient amount of refrigerant is still the main cause of a non-functioning AC system. Wisconsin certified. Sometimes changing the temperature can temporarily stop the sound. Turn on the AC and set it to the coldest setting, and the fan speed to maximum. Automatic transmission. Its purpose is to seal the combustion gases within the cylinders and to avoid coolant or engine oil leaking into the cylinders. The blend door actuator may require recalibration after replacement. Air should blow out of the vents at different intervals during the reset. If your Grand Caravan is losing coolant, that means there is a leak somewhere or it is getting burned up inside the engine. I have a 2005 . There are many reasons why the heater in your Dodge Grand Caravan is not working properly. 24,855 miles. The AC will start to calibrate and reset. Refrigerant leak in Grand Caravan can be caused by leaking O-ring seals, leaking condenser or evaporator core, or a cracked hose. When the heater is turned on and the AC turned off, the compressor does not turn on and the evaporator is not cooled. The blower motor is the central component of the air conditioning system in Grand Caravan, responsible for blowing cold air through the AC vents. Cabin air filter captures most of the dirt or other airborne particles, but some escape and fall on to the evaporator. There is no prescribed time for changing cabin air filter, but most manufacturers recommend a change after 10,000-20,000 miles. Press and hold the top one and bottom one. . If the water pump has worn out and the coolant is not being circulated as effectively as it used to, it can cause the heater to stop working properly because theres less coolant available to transfer heat between the engine and the heater core. The system is filled with forming gas (nitrogen with a little hydrogen) in the workshop. If the pressure is higher than the recommended pressure, let some refrigerant out preferably into a rag to avoid exposure. Before you consider replacing the heater core in your Grand Caravan, it is recommended to flush the existing heater core. A leaking condenser can lead to a loss of refrigerant and reduced cooling performance of the system. Sometimes when a thermostat goes bad, it stays stuck open. Dodge Caravan Climate Control Air Conditioner Blows Hot A/C blowing hot air CHEWBUG2 MEMBER DODGE CARAVAN I am a lady and do not know alot about cars, but I think I got scammed when I took my car in to have the a/c fixed. Just have it refilled and you can drive with pleasant temperatures again. However, when you turn the A/C back on by pressing the A/C button rather than the Auto button, it will allow you to also engage the Recirc button. tried different settings, defrost, floor and turn the heat on. There are many reasons why air conditioning may not be working properly on your Dodge Grand Caravan. Blend door actuator plays a role in controlling the air flow and temperature inside your Grand Caravan. Vehicle: 2000 Dodge Grand Caravan LE; Engine 3.8L, automaticDual heaters (front and rear)Front heater has Driver Passenger controlsAbout 3 days ago the heat stopped coming out of the drivers. If the compressor fails, the AC will only blow warm air. The leak can be diagnosed by injecting small amount of fluorescent dye into the AC system. There are test kits available in the market in which you just have to insert a tube filled with colored liquid in the radiator (in place of the radiator cap), and then start the engine. Over time, these particles build up on the fins and block the air flow through the evaporator, causing reduced air flow in the cabin and poor cooling. All do-it-yourself projects entail some risk. The only thing that helps is swapping with a new one. Finding these mostly very small leaks is often not easy. Jun 14, 2017. It consists of moving parts that convert what is actually a gaseous coolant into liquid this is how your vehicle is cooled. It is now 90+ degrees where we live with high humidity. Below is a chart that will help with proper pressures. Ideally, the refrigerant should never leak in a properly sealed AC system, but most car AC systems do leak small amount of refrigerant over time due to minor imperfections and may need recharging after every few years. This mode is useful for clearing fog from the windows. Dirty evaporator can cause weak airflow and reduce the heating performance in Grand Caravan. Most diagnostic devices then ask for some information about the vehicle. If the condenser is dirty on your Grand Caravan, the simplest solution is to clean it. (But it bothers the wife about 10 days out of the year.) This is . Follow the manufactures repair procedure and use appropriate safety procedures. Your vehicles air conditioning system has an expansion vale or an orifice tube, depending on the model. After the Dealer replaced 2 major Components in the AC System, the Air still comes on in Neutral and Park even when the Air is not switched on and only the Outside Vent is on. The Dodge Caravan is a minivan manufactured and sold by the Dodge division of the Chrysler Group. The function of both expansion valve and orifice tube is the same, to restrict the flow and reduce pressure of the refrigerant before it enters the evaporator coil. Less common causes are clogged expansion valve or orifice tube, overcharged oil, faulty blend door actuator, or a defect in the climate control unit. In addition to the vehicle make, model, and engine type, you usually also have to type in the Vehicle Identification Number (VIN). In any case, it is advisable for laypersons to visit a workshop. Remove the cap from the low pressure service port labelled L, and connect the AC recharge kit. The air flow from the vents is choppy and not smooth. Low coolant level or air in the cooling system can cause the heater to stop working properly in Grand Caravan. The failure mileage was 125,393. front air stop blowing. 8 people found this helpful. HVAC with 3 zone controls. Flushing is done by pushing water through the outlet hose of the heater core and draining the gunk from the inlet hose. Jul 18, 2012. It is generally recommended to replace the cabin air filter every year at the start of the winter season. ZIP: #1 Paul Reputation 2,020 #2 tenspeed Reputation 1,510 #3 Dan Ritz Reputation 1,480 If there is a problem with the temperature of the air conditioning system, it could be due to a bad blend door actuator. Most of the time if your AC stops working on a 2002 to 2008 Dodge Caravan it is because it lost all its refrigerent due to a. That means every time you start the van, climate controls go through self adjustment and check every blend door actuator and blend door. This can happen due to a leak or if the AC has not been recharged for a long time. Caravan fan and ac not working 1 Answer. It does this by allowing water to enter the engine when it is getting hot, and by keeping coolant from entering while the vehicle warms up. If it is blown, replacing the fuse will only solve the problem for a very limited period of time. Larger leaks may already be heard or you can find them with a leak detection spray. Initially thought to replace the entire system, but figured it would be cheaper to replace the valve, clean the rear evaporator and replace the dryer. Mine is 2011 and has turn knobs for fan & temp. Seem to be moving and so forth. QuiteAlright is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video. If you are only topping off the refrigerant in your Dodge Grand Caravan with off-the-shelf refrigerant recharge cans and not repairing the leak, you may have flooded with AC system with oil since these cans often contains added oil. In the event of a defect, the mechanic can directly initiate the repair. stop for 20 minutes and it work for 1 hour then quit. There are many reasons why your Dodge Grand Caravan AC is not cooling properly. The compressor is the heart of the air conditioning system in Dodge Grand Caravan. Many - Many - Many . Thanks Just have it refilled and you can drive with pleasant temperatures again. Blower not working, no air condition or heat? Eric is online now Continue Related Dodge Questions My Dodge grand Caravan rear AC is blowing hot air while my It is not only responsible for pumping the refrigerant throughout the AC system but also converting the refrigerant from gaseous state to liquid state as it passes through the condenser. Locate the three leftmost buttons in the AC controls. The most common causes for AC not cooling properly in Dodge Grand Caravan are low or overcharged refrigerant, compressor malfunction, clogged cabin air filter, dirty condenser or evaporator coils, dirty or sluggish blower motor, and bad fuse or relay. Remove the blower fan in a Dodge Caravan by first disconnecting the battery, then waiting two minutes to disable the airbags. To begin troubleshooting, you must first connect the diagnostic tool to your Grand Caravan. However, the high-pressure refrigerant pulls these chips back with it during operation and the next damage is inevitable. ( 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | SE | CVP | AMP | SXT | LIMITED | CREW | VALUE PACKAGE | EXPRESS ).This is just the explanation video. Tried the above reset, didn't work. After two years, Braun left to pursue her entrepreneurial dreams. An overcharged system not only affects cooling performance but can also damage the compressor and sometimes can cause a major leak. Happened on the 2008 Dodge I drive for the company. 3. But if the thermostat has developed a defect and is stuck to open position, the coolant will continuously flow through the radiator and the engine may take a long time to reach its optimal operating temperature. 7.5 pretty bad Typical Repair Cost: $1,500 Average Mileage: 43,900 miles Total Complaints: 4. Over time, the heater core can begin to rust or mineral deposits can form in these channels, blocking the flow of the coolant. experience as repair shop manager and technician. 2000 Grand Caravan - drivers side heat not working - Passenger and rear are fine 2 Answers. Therefore, the filter performance will not increase significantly even after cleaning. A family member purchased a new 2017 Grand Caravan SXT with the rear heat / ac. Step 2 Turn the Mode Control dial to "Panel." This setting only directs air to your face and upper body and not your feet. Grand Caravan SXT 3.6L V6. What 3 far left buttons? Dirty evaporator can also be the reason for AC problems on your Dodge Grand Caravan. Is rear defroster blinking on your Dodge Grand Caravan and CLIIMATE CONTROLS do not work for first 10 - 30 seconds after you have started the van? nothing. Insert the key into the ignition and turn to the "On" position. Water pumps usually last for more than 100,000 miles, but they can fail at any time. I have a 1994 Dodge Caravan with 130,000 miles on it. It is a well known problem and any Caravan I have every seen has had this problem. If the condenser is dirty on your Grand Caravan, the simplest solution is to clean it. If you only install a new compressor here, another failure is inevitable, as the chips immediately destroy the new component. This A/C Block Kit, ATMFSFD, is used to block off the rear A/C on the Ford E-Series van with #6 an.. $61.00. Tried all combinations of power on, rotating the know etc. A dirty filter causes the overall ventilation of the interior to deteriorate resulting in reduced cooling, heating and air flow. The procedure, commonly called calibration, initiates the self diagnostic test and system reset for the vehicle's air conditioning. Rear controls stuck and blowing high heat no matter what happens in other zones. Dirty evaporator can also significantly reduce AC cooling performance in Grand Caravan. Place the key into the ignition and switch it to the "On" position. My rear a/c is not working in my 2008 town and country, blowers work fine but only blow warm air. RB The Mechanic recommends to follow safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, chemicals, or any other tools or equipment seen or implied in this video. The front air con works greatany ideas would could be the problem and how to fix it! 2016 Dodge Grand Caravan This problem may be covered under warranty. RB The Mechanic assumes no liability for property damages or injury incurred as a result of any of the information contained in this video. You can recharge your AC through the low-pressure port with a do it yourself AC recharge kit. The most common reasons a Dodge Grand Caravan ac isn't working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. The buttons of the air conditioning unit may start flashing due to a momentary electrical failure, in which case a reset of the AC is necessary. The pressure values based on ambient temperatures differ depending on the type of the refrigerant. You can use power washer for cleaning, but make sure that its at low pressure setting, as high pressure can easily damage the delicate fins on the condenser. Show more. Start by inspecting the condition of the cabin air filter on your Grand Caravan. In case of severe contamination, multiple components may have to be replaced, including the condenser, the evaporator and the compressor. If your Grand Caravan has push start/stop button, then its possible that your vehicle may not start due to weak key fob battery. When a blower motor goes bad, it usually makes unusual noises when in operation, and the passengers may feel reduced air flow from the AC vents. 1. 2014 caravan. Click on the links below to see my videos on how to replace rear or passenger blend door actuators.This vans are equipped with \"self adjusting\" blend door actuator system. Vehicle: 2000 Dodge Grand Caravan LE; Engine 3.8L, automaticDual heaters (front and rear)Front heater has Driver Passenger controlsAbout 3 days ago the heat stopped coming out of the drivers. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. The air conditioning system in Dodge Grand Caravan has a condenser coil that sits at the front of the vehicle, and is responsible for releasing the heat from the refrigerant into the ambient air. So, all of them must be inspected when diagnosing poor air flow. Home Troubleshooting Dodge Grand Caravan heater not working causes and diagnosis. The design of the heater core is similar to the radiator, it has narrow internal channels through which hot coolant flows. "AC unit" - what does that mean? Aug 25, 2008 2003 Dodge Caravan helpful Flashing lights! In addition to the normal loss, component defects are usually responsible for the escape of the refrigerant gas on Dodge Grand Caravan. Excessive oil can also reduce the performance of the compressor and can cause it to fail prematurely. 2010 T&C Touring, 3.8L, 6 Speed 62TE Trans. Over last two years the front dash vents gradually lost all read more Chris Shop Foreman 8,839 satisfied customers 2001 dodge grand caravan sport: expansion valves..ac compressor..kick Blend air doors can be a problem. Rear A/C Block off Kit Air Conditioning Block Off Compatible with 2012-2016 Town/Country Dodge Caravan w/Dual Bolts. A dirty filter causes the overall ventilation of the interior to deteriorate resulting in reduced cooling and air flow. If the temperature doesn't change at all, the door may be stuck or broken. This is an illustration of the normal repair that we see in the shop. Blend door actuator plays a role in controlling the temperature inside your Grand Caravan. If only hot air comes out of the air vents in your Grand Caravan, then the problem probably lies somewhere else. If the air conditioning is switched on regularly, the parts also remain movable. Check all front HVAC fuses and relays M11 and J15 I believe, all good. Keep in mind, an AC compressor can fail without any apparent cause, especially in older vehicles or in vehicles that have racked up too many miles. The result is a defective compressor that can no longer be repaired. Since the heater core is usually slightly higher, the air will accumulate in there first. As a rule, there is no avoiding a change if the filter is dirty. If the fuse is blown, replace it with a new one with the specified amp rating. The two systems are joined, so if for example you lose freon, you will lose AC in the front and rear. The cabin air filter captures most of the dirt or other airborne particles, but some particles escape and can get lodged on to the evaporator. The most common symptom of a faulty blend door actuator in Dodge Grand Caravan is a slight clicking sound (or other unusual noise) repeatedly coming from under the dashboard. Had a similar issue with a blend door on a 2009 Honda Civic and those blend doors are VERY easy to get to, so I checked them both and the passenger side was sticky, sprayed some lube on the actuator arm and dusted the gunk off and it's been working since. Once we know what the actual charge is in the system then we can start narrowing it down to just the rear system and a possible door motor issue but if the charge is weak then we will not fix it unless we check this first. You dont necessarily have to visit a workshop to clean or replace the pollen filter on your Grand Caravan. The dryer is often overlooked. The heater in Dodge Grand Caravan ensures comfortable temperature in the passenger compartment when the weather is chilly. Note: If the blower motor suddenly fails from one second to the next, you must first check whether a blown fuse is responsible for the failure. The head gasket is responsible for providing the seal between the engine block and cylinder heads. I have a 2005 . As a rule, there is no avoiding a change. So, even if you recharged your Grand Caravan AC at the recommended pressure, the system could still over pressurize when the ambient temperatures get warmer. If the liquid changes color, then there is a leak in head gasket. The pollen filter, also known as the cabin air filter or microfilter, is responsible for filtering the air that the passengers breathe in the cabin. If you turn it to heat, does the air get hotter? In the AC settings, find the three leftmost buttons. exactly issue im not sure why people mentioned the filter or a door not closing those 2 has nothing to do with a fan not working !! Dodge Grand Caravan Sport: 2003 Grand Caravan Sport 3.8l 128000km 2003 Grand Caravan Sport 3.8l 128000km with front- and rear-AC system. It also puts unnecessary strain on the entire AC system which negatively impacts the fuel consumption. Feel both the rubber lines going in and out of the heater core after the engine has warmed up. What to do? Heat stops working intermittently on really cold days, the only way to fix it is to turn the car off and restart, or switch the temp controls over to . If the blend door actuator fails to fully open the blend door towards the heater core, it will result in poor heating performance. To complete the reset, press the top button. A low refrigerant level in your Grand Caravan does not necessarily mean there is a leak. 5th Generation Chrysler Minivans: 2008-2020, 4th Generation Chrysler Minivans: 2001-2007, 3rd Generation Chrysler Minivans: 1996-2000, 2nd Generation Chrysler Minivans: 1991-1995. Caravan fan and ac not working 1 Answer. The most common causes for AC blowing hot air in Dodge Grand Caravan are low or overcharged refrigerant, compressor malfunction, dirty condenser or evaporator coils, faulty blend door actuator, defective evaporator temperature sensor, bad AC pressure sensor, and bad fuse or relay. How to Repair a Dodge Caravan Air Conditioning System Jonesy's 24.8K subscribers Subscribe 436 262K views 10 years ago #AmazonAssociate In this video we show you How To Repair a Dodge Caravan. The excess oil may pool in various places of the AC system and can coat the inner walls of the evaporator and condenser, diminishing their ability to absorb or dissipate heat, consequently reducing the overall cooling performance. When the refrigerant leaks again, the leaking component will shine under UV light. A bad water pump will not only cause poor heating, but can also result in engine damage due to overheating. Two compressors for a rear air problem? Once again I don't have rear climate controls in this van. It doesn't bother me. If there is no air flow or reduced air flow from the vents on your Dodge Grand Caravan, bad blower motor could be the culprit. The most common reasons a Dodge Caravan ac isn't working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. No luck. The most common causes for blower motor not working in Dodge Grand Caravan are blown fuse, bad relay, resistor or control module malfunction, and faulty blower motor. Eric, Automotive Repair Shop. It was out of warranty when it went, and the shop wanted <too much, for it to be worth it to me> to repair it (had it in for another issue & asked them to check it.) Anytime there is a problem with the temperature of the air conditioning system, it could be a problem with the blend door actuator. Both of these are at risk of clogging due to contamination, for example due to metal shavings from a failing compressor. Another patient said the AC is just blowing warm air. Step 1 Start the Dodge Caravan. The hot coolant is pumped through the heater core located behind the dashboard. There are 2 separate evaporators but only one compressor. #1. A blown head gasket can cause coolant to leak into the combustion chambers and burn off. The sound is most prominent right after you start the vehicle. It is important that you enter this 100% correctly, otherwise the result of the search may be inaccurate. 56,823 Satisfied Customers 20+ yrs. However, if you turn the A/C completely Off, turn the ignition system off. If you dont service the AC system in your Grand Caravan for a long time, the refrigerant level will eventually get so low that the system loses its cooling capacity. When looking for the reason, you should start with the most obvious causes: low coolant level or air in the cooling system, and clogged heater core. As a rule, there is no avoiding a change if the filter is dirty.