Monday, August 19th, 2019 AT 6:39 PM This door can be used to block or allow the flow of air inside your vehicle. The first step to remove the cabin filter is to locate where it is installed on your vehicle. Rxmechanic.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to Amazon.com. Finding these mostly very small leaks is often not easy. 2007 CHEVROLET TAHOE V8 2WD AUTOMATIC Front ac works fine but rear is blowing hot. Just have it refilled and you can drive with pleasant temperatures again. Home Troubleshooting Chevy Tahoe AC not cooling causes and diagnosis. Keep in mind that reduced air flow doesnt always indicate a problem with the blower motor, as it can also happen due to a clogged cabin air filter, dirty evaporator, or a bad mode door actuator. What could be the problem". The fuse is a very sensitive component in the HVAC system. If this is the case, the only option is to replace the broken part. So, you will most likely experience a situation where the front AC blows cold, the rear AC blows hot, and vice versa. I have a 2003 Chev Tahoe z71 with 88,000 miles. Need to fix your car's air conditioner? Rodents, such as rats or mice, can get under the hood or even make their way inside the dashboard of your Tahoe and chew on wire coatings, which can cause all sorts of electrical problems. If bite marks are discovered, carefully examine all the cables and hoses for damage, including electrical wires for the blower motor. Quite often the door will get jammed at one end. The dealer said it was a modulator. I recently purchased a 99 Tahoe which is in pristine condition, however on my way to work a few days ago the air conditioning was blowing ice cold then slowly faded away to just air. February 2007 I have a 2001 Tahoe which also had fan problems. So, if youre battling this issue in your car at the moment, ensure to implement the recommended solutions above. The blend door actuator may require recalibration after replacement. The result is a defective compressor that can no longer be repaired. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. All models. However, if you already have a bad air conditioner compressor, all you have to do is simply replace the component. If the result of this process doesn't fix the problem, move forward to the next step. I know this is probably a long shot, given the time stamp on the post, but what was the outcome on this? However, the cost can be more depending on whether you have to replace faulty components like the compressor, sensor, condenser, or hose. I installed the resistor and now the REAR AC works fine, but the front AC still doesn't work and there is absolutely no air blowing from the front vents. Anybody know what this problem is? Refrigerant leak in Tahoe can be caused by leaking O-ring seals, leaking condenser or evaporator core, or a cracked hose. It is a 2001 Chrysler Town and Country. The AC blower motor in Chevy Tahoe needs electricity to work. The blower resistor helps regulate the flow of air that is blown into your vehicle as instructed by you through the air vent controls. There are many reasons why the AC blower motor may not be working in your Chevy Tahoe. In rare cases, a fault in the climate control unit can cause the AC to stop cooling. Excessive oil can also reduce the performance of the compressor and can cause it to fail prematurely. When you increase or decrease the AC fan speed in your Tahoe, the climate control unit signals the resistor module to increase or decrease the flow of electric current to the blower motor. Remove the electrical connector from the blower motor. I have read that the output directly at the vent should be about 40-50 when in good shape (Please correct me if I . I noticed when I turn the blower switch to the off position the light on the ac button itself flickers and if I wiggle the switch around the lights flash as if their is a short. If the refrigerant level goes down again quickly, it means there is probably a leak. #5. Chevrolet Tahoe. I have a 15 passenger 97 Dodge Ram van, when I accelerate the van to move faster with the a/c on the air is still blowing, but not thru the vents, I take my feet off the accelerator and then the air blows thru the vent and then I accelerate again while its blowing thru the vents it stops blowing thru the vents again, can someone help me understand what's going on? Note: Dirty cabin air filter mostly only leads to reduced cooling. I am frustrated and stuck. Blend door actuator plays a role in controlling the temperature inside your Tahoe. You will also get to have more knowledge of how the ventilation system of your vehicle operates. In any case, it is advisable for laypersons to visit a workshop. This saved my daughter getting ripped off $1300. Does take a long time, if you attempt, make sure to have atleast 3-7 hours aside.well depending on your tools and know-how. So, if the blower resistor in your vehicles ventilation system is bad, it can be why the car heater is not blowing air and affects the flow of cool air inside your vehicle. 0 answers. Does anybody know if there are 2 separate blower motors for the front and rear AC blowers? Over time, grime, bugs and other small particles can build up on its surface and in the gaps of its mesh. However, if youre not sure of doing a perfect job, kindly contact an expert auto technician. Chevrolet Tahoe. I Checked The 25 Amp Fuse Still No Blowing In Rear Of Car. If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturers recommendation. The leak can be diagnosed by injecting small amount of fluorescent dye into the AC system. Tom is online now Related Chevy Questions The most common causes that hinders normal operation of air conditioning system on your Chevy Tahoe are dirty cabin air filter, refrigerant leak, dirty or clogged condenser, dirty or clogged evaporator, bad blower motor, defective compressor, faulty blend door actuator or any fault in the electrical system. Did you ever figure out what was wrong with your van? The catalytic converter is a critical component of your car's exhaust system that helps minimize the amount of toxic gas released into the atmosphere. If you dont service the AC system in your Tahoe for a long time, the refrigerant level will eventually get so low that the system loses its cooling capacity. The two most prominent symptoms of a clogged up evaporator on your Tahoe are: Cleaning the evaporator on Tahoe is not a simple task. In the event of a defect, the mechanic can directly initiate the repair. If the thumbwheel is wheeled to the right, it will make the vents fully open the vents while the opposite direction closes the vent of your vehicle. Although blocked vents can sometimes also be a culprit; however, you can blame a low refrigerant level nine times out of ten. The operations can be altered by a simple electrical fault, especially a blown fuse. So, if youre experiencing less cooling from your cars front AC, ensure to check for clogs in the front vents or the air intake system. Cleaning the evaporator in Tahoe is not a simple task. In order to do this, you must run the air conditioner on full blast at least once, around 15 minutes every three weeks. If the fuse is blown, replace it with a new one with the specified amp rating. It is also cryogenic and can cause severe frostbite when it comes in contact with the skin. Once you ascertain the exact reason why your Dodge Durangos front AC is not working but back is, then you can proceed to fix the problem. Welcome to rxmechanic.com. Insufficient amount of refrigerant is still the main cause of a non-functioning AC system. If any of these two areas are blocked by debris or any other substance, the ventilation system of the car will not be able to blow air inside your vehicle. The function of the blower motor resistor is to control the speed of the blower motor. If you only install a new compressor here, another failure is inevitable, as the chips immediately destroy the new component. Blower motors can fail at any time without warning, but usually there are early signs before they stop working. Have gone back and forth with my mechanic and need to get it fixed Live in Az and my family is HOT sitting in the back. The pollen filter, also known as the cabin filter or microfilter, is a central component of the ventilation system in your Chevy Tahoe. We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. You see, that was not so difficult. A struggling blower motor due to internal component degradation can put a lot of strain on the resistor when in operation, causing it to overheat and burnout. Mechanic's Assistant: When it comes to this particular vehicle, have flat tires been a problem in the past? OR unplug the switch and take a jumper wire or a pair of needle nose pliers and jumper across the 2 terminals of the switch connector. It also puts unnecessary strain on the entire AC system which negatively impacts the fuel consumption. Once the leak has been found, this must be closed again by replacing the respective component. In case of contamination, you may have to flush out the contaminants from the AC system of your Tahoe, including the condenser and the evaporator, before putting in the new part. Therefore, if you have a faulty cooling fan, it will impact the condenser negatively and result in some sort of HVAC system malfunction. I assume one of the ducts has come loose feeding one of the ceiling vents. I guess you are referring to the front hvac blower not blowing air at any speed and not coming out at any vents at any mode position. I removed the actuator that was anchored by 2 screws and then the broken plastic cam. Check out the three hvac labeled fuses. Z. Do you still sweat while driving your Chevy Tahoe? Had the compressor replaced in Aug 07. The refrigerant pressure is affected by the outside atmospheric temperature. New to this thread and having the EXACT same issue. Then remove the filter from its housing. You can feel a little cold air come out when driving but at a stop or idle no air. When I put my hand on the blower under the dash it didn't feel as though it was working even though the rear AC was on. A failed condenser can prevent cool air from flowing through your vents. The air filter helps to trap dirt, dust, and other contaminants from accessing the HVAC system. In some cases, the dust build-up may be protruding from the vent. 0%. Monday, August 19th, 2019 AT 6:40 PM We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. When this component is faulty or clogged, it will be difficult to collect air. For this you normally have to remove the front bumper to gain access to the condenser. - All You Need To Know. Yes, that's it. It has front and rear a/c but olny the rear blows cold air and the front only blow hot when a'c is on. The system is filled with forming gas (nitrogen with a little hydrogen) in the workshop. Although most of the dirt and other particles in the air are filtered by the cabin air filter, but some particles do escape and can cling to the fins of the blower cage. The refrigerant is designed to work in synergy with the compressor within the air conditioning system. The fan only worked on settings 3 through 5. symptoms of Last Year The Rear A/c Unit Stopped Blowing Cold Air And Now The Front Side Has Also Quit. An overcharged system not only affects cooling performance but can also damage the compressor and sometimes can cause a major leak. A bad relay can also be the cause of AC blower motor failure in your Chevy Tahoe. The most common causes that hinders normal operation of air conditioning system on your Chevy Tahoe are dirty cabin air filter, refrigerant leak, dirty or clogged condenser, dirty or clogged evaporator, bad blower motor, defective compressor, faulty blend door actuator or any fault in the electrical system. Otherwise no problems. 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. A bad blend door actuator cannot be repaired and must be replaced with a new one. Of course, a blown fuse can cause a cars AC not to work. Airflow control diverters or flaps AC vents issue is one of the culprits of this problem. One garage I took it to couldn't figure out what was wrong, and they told me to go to the dealer. One is labelled H for high-pressure and the other one is labelled L for low-pressure. However, if you have a situation offront AC not working but back is,that must be a tricky challenge demanding critical analysis. The AC vents are designed with open spaces to allow cold air to flow through into the car. Though you will not damage your vehicle if you decide to drive with a bad ventilation system, however, you need to be aware of the probable factors that could have caused this problem, so you know if your car just needs a quick fix or not instead of unnecessarily inconveniencing yourself and also your passengers. The driver's side blows hot air, but the passengers side blows cold air. This challenge can be overwhelming when you cant figure out what could be wrong. The two most prominent symptoms of a clogged up evaporator in Tahoe 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 I could save the $ on the diagnostic test, that would be great! Yesterday it stopped putting out cold air completely. There are several causes for AC not blowing cold air in Tahoe, which we will go through in this article. Unfortunately, this procedure does not allow you to get into the deeper layers of the filter. Trust me I have checked all but get nothing no matter what button I turn on any level. In addition to the vehicle make, model, and engine type, you usually also have to type in the Vehicle Identification Number (VIN). Since the two heat exchangers (condenser and evaporator) are designed in cross-flow design, the detergent finds the path with the least resistance and leaves the chips behind. With the ac on and the compressor not running, lightly tap the switch with a wrench of something, just not too hard. The most common causes for AC not cooling properly in Chevy Tahoe 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. There are many reasons why air conditioning may not be working properly on your Chevy Tahoe. It was very tight and sturdy. Blower motors are maintenance-free and can easily last for over 10 years, but they can fail earlier due to overheating, moisture damage or manufacturing defect. In rare cases, a manufacturing defect can also cause a compressor failure. Do you have the same problem? It worked for two weeks - not great but it put out cold air, then a minute or two of warm air w/ the smell again. 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In addition to the normal loss, component defects are usually responsible for the escape of the refrigerant gas on Chevy Tahoe. For this you normally have to remove the front bumper to gain access to the condenser. However, if you have a blown fuse, ensure to check it out with a working voltmeter. A knocking noise could be another indicator of a bad blend door actuator on your Tahoe, although its quite rare. If this is the case, ensure to replace the blown fuse and rectify the electrical faults. Meanwhile, the car makes and model can also impact the cost of repair. If your cars back air conditioner is working and the front fails to work, you most likely have a blocked front AC vent. Figure 1. Some of the signs that let you know that your cars AC vent is clogged include the following; inconsistent temperature circulation, dust build-up within vents, overheating, etc. Could this be the ac control switch on the dash? However, you can close or control the direction of the airflow. The Back A/c Blows Good And Is Cool But Not As Cold As Before. If found dirty, clean it using a brush. Yes, a dirty air filter can alter your cars air conditioner from cooling properly. Starting blowing out warm air with an old AC smell. Over time dust can accumulate on the fins and reduce the air flow, which reduces cooling performance. The only thing that helps is swapping with a new one. Unfortunately, this procedure does not allow you to get into the deeper layers of the filter. I changed the blower relay in the fuse box next to the battery and put in a new blower fan under the glove box but it still does not blow air out in the front. The most common symptom of faulty blend door actuator on Chevy Tahoe is a slight clicking sound repeatedly coming from under the dashboard. If your blower motor is bad, it is one of the signs to notice is your vehicles blower motor relay is not functioning, and you might find out that the blower motor fuse is also blown. Decisions, decisions. 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