The fan only worked on settings 3 through 5. If you work on other areas like cleaning the vents, topping off the refrigerants, etc., and you have a blown fuse, the AC will not work. If there is a bad ventilation fuse in your vehicle, the blower motor will not be able to carry out its function by blowing air through the vents. Well if you have another car to drive while your tahoe is MIA, i would recommend that. Simultaneously my oil/fuel/engine temperature/ and voltage gauges stopped working, AC stopped blowing cold, lock/unlock and power windows failed. Ensure to prevent water from entering the vents directly; hence the need to ensure that the detergent and water solution form lather. THE SAME PROCEDURE IS USED FOR A TAHOE OR. 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. I tshold tell you on the truck there should be a sticker underhood with charge amount. If there is no refrigerant in your vehicles cooling system, your conditioner cannot blow cool air. If this motor fails, there will be no flow of air through the vents of your vehicle. My front air does not blow out (it works in the back). However, using cheap or homemade cleaning tools can make the job easy. Connect the pressure gauge to the low pressure (L) port in Tahoe. You have to know that you cannot use the heater or air conditioner in your vehicle if your air vents are clogged or blocked. I checked the ground wire underneath pillar A at the top left of dashboard. Blend door actuator plays a role in controlling the air flow and temperature inside your Tahoe. Reconnect and see if the behavior changes. 2.71 lbs. Hot or Cool air is blown into your vehicle through the air vents controlled by your HVAC system. However, if the cooling fan is the real issue, kindly get a new replacement in order to rectify the problem immediately. However, the high-pressure refrigerant pulls these chips back with it during operation and the next damage is inevitable. A clogged air intake system may be the reason why your cars air conditioners front vents are not blowing out. Cabin air filter captures most of the dirt or other airborne particles, but some escape and fall on to the evaporator. That's an impressive piece of work :shades: . All models. The following solutions will fix the problems outlined above. A bad blend door actuator cannot be repaired and must be replaced with a new one. Used 4 minute JB Weld with extra hardner and filled the cavity and held both halves together then added the weld all around. I have a 2005 4.8L Tahoe. Both of these are at risk of clogging due to contamination, for example due to metal shavings from a failing compressor. 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. For this purpose, this article is strictly focused on the factors that can cause your vehicles air vents to stop functioning and how to fix some of these problems with a few easy steps. When this happens, you may hear unusual whirring or droning noises from behind the dashboard. In rare cases, a fault in the climate control unit can cause the AC to stop cooling. The pollen filter, also known as the cabin air filter or microfilter, is responsible for filtering the air that the passengers breathe in Chevy Tahoe. My Air Conditioner cools fine and then it will blow warm air for awhile. A bad relay can also be the cause of AC blower motor failure in your Chevy Tahoe. Due to the complexity of the replacement job, it is not recommended as a DIY project. 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. Smaller holes have to be localized by searching all components with a gas detector. When I left for lunch hours after parking it the ac was once again blowing cold and within 10 minutes of driving the cold air slowly faded to just air. The A/C blew super cold air up until a couple of weeks ago, now it is only putting out about 55-65 degrees at the vent, still fairly cool, but not COLD like it was. Start by inspecting the condition of the cabin air filter on your Tahoe. Excessive oil can also reduce the performance of the compressor and can cause it to fail prematurely. Blend door actuator plays a role in controlling the temperature inside your Tahoe. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. The blend door actuator may require recalibration after replacement. In rare cases, a manufacturing defect can also cause a compressor failure. The HVAC system is designed to blow air from either the floor, mid or defrost If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturers recommendation. 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. In order to find leaks in the air conditioning system, a leak search is carried out in the workshop using forming gas even the smallest leaks can be detected. That could be a plugged orifice tube or a problem with the temp blend door. 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. A common symptom of a faulty blend door actuator in vehicles with dual zone climate control system is one side blowing hot air while the other side is blowing cold air. I also tested the compressor switch which was good. I removed driver lower dash panel, sub panels and the 3 air/mixer actuators are visible and easy to get to. Shake the canister briefly and release the refrigerant into the system until the recommended pressure has been achieved. 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He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. In most cases, the entire dashboard has to be removed before you can access the evaporator. Dirty evaporator can also be the reason for AC problems on your Chevy Tahoe. In any case, it is advisable for laypersons to visit a workshop as you can easily do more damage to your vehicle, especially to the electrical system. Then carefully clean or replace the filter into its housing. When the battery is disconnected and reconnected, many of them go through a calibration sequence to determine the full range. We are a team of ASE certified mechanics This is a common cause of the air conditioner in your vehicle to stop working. When looking for the reason, you should always start with the most obvious cause, low refrigerant level in the system. If the condenser is dirty on your Tahoe, the simplest solution is to clean it. A knocking noise from behind the dashboard could be an indicator of a bad blend door actuator in your Tahoe. However, due to excessive dust or dirt build-up, the air filter can be clogged over time, resulting in several malfunctions. If I could save the $ on the diagnostic test, that would be great! The cost of fixing the problem with a car's HVAC system where the front AC is not working is estimated to be around $100 - $900. A broken compressor is usually irreparable. Stop blowing/no air flow from ac vents or even defroster vents, etc but the rear continues and is good. If the fuse is blown, replace it with a new one with the specified amp rating. The refrigerant pressure is affected by the outside atmospheric temperature. The pressure values based on ambient temperatures differ depending on the type of the refrigerant. I have a 2002 Dodge Durango SLT Plus 4X4 and when I purchased it, the AC did not work. Ok, are the trim panels easy to remove? 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. To check the fuse, pull it out of the fuse box using a fuse puller or needle nose plier and hold it against the light. Turn on the multimeter and insert the probes into the connector, one at each point making sure the metal part of probes dont touch each other. 2007 Tahoe. If there is no air flow or reduced air flow from the vents on your Chevy Tahoe, bad blower motor could be the culprit. 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. If the reading is lower than 8amps, it means that your vehicles blower motor is faulty and should be replaced. When looking for the reason, you should always start with the most obvious cause, insufficient amount of refrigerant. Proper diagnosis is the first step to fixing any of the problems above. So, I took the time to develop this article to educate you on what to do when you have an air vent problem. Insufficient amount of refrigerant in the AC system is one of the leading causes of AC not blowing cold air in Tahoe. Some filters are found under the bonnet of some vehicles, while some are located under the vehicles passenger seat. You can use these common factors to properly investigate the actual cause of your vehicles vent problems. Your air conditioning system no longer cools properly? This puts strain on the motor and further reduces the air flow and cooling performance, and may also cause unusual noises from behind the dashboard. The blow motor functions with the aid of the blower resistor. So, you should be attentive to these probable causes listed below: This is one area to check that might be responsible for your dashboard air vents not working. Home Troubleshooting Chevy Tahoe AC not working causes and how to fix it. If you are lucky, the wiring diagram will be drawn on the facing. Locate the blower motor in your Tahoe, typically located under the passenger side dashboard. However, if you dont turn on the air conditioning on your Tahoe for a long time, the parts will stick. You will also get to have more knowledge of how the ventilation system of your vehicle operates. 0 answers. The output voltage on the multimeter should read around 12 volts. yes you can apply 12 volts dc power to the male pins on the blower motor after removing the connector and observing polarity of the wires so you know which pin is the ground (negative which is the black wire, positive the red) and which one is the positive. Otherwise no problems. #5. The first step to remove the cabin filter is to locate where it is installed on your vehicle. Used tin sheers to cut around the tracing leaving enough space to accomodate the weld mix. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. If the volts reading is normal, then the fault probably lies with the blower motor itself. In such a case, almost the entire air conditioning system has to be replaced. Not exactly sure what I am looking for. You can recharge your AC through the low-pressure port with a do it yourself AC recharge kit. You have an electrical issue with the rear unit that needs to be diagnosed. During your diagnosis to find out why your cars front AC is not working, if you discover any leaking AC unit hose, ensure to seal it. However, if the resistor has burned out due to overheating, the blower motor may cease to function. A damaged belt can also lead to this issue. Remember cruising downtown on a hot and sunny or driving on a snowy day, then suddenly your dashboard air vents are not working. Even after the a/c was recharged. Could be fuses, either of the switches, the resister, the wiring or the blower motor itself. You are using an out of date browser. symptoms of Last Year The Rear A/c Unit Stopped Blowing Cold Air And Now The Front Side Has Also Quit. Your cars air conditioning system works with refrigerant, which helps to circulate cold air through the cabin. 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. With the ac on and the compressor not running, lightly tap the switch with a wrench of something, just not too hard. All the actuators operated the doors perfectly ending the hot air escaping past the heater door into the air conditioner duct. I removed the actuator that was anchored by 2 screws and then the broken plastic cam. Unfortunately, this procedure does not allow you to get into the deeper layers of the filter. Anybody know what this problem is? This information is typically located under the hood and/or in the owners manual. Theres practically no problem we wont be able to solve. The fuse is a very sensitive component in the HVAC system. Refrigerant leak in Tahoe can be caused by leaking O-ring seals, leaking condenser or evaporator core, or a cracked hose. If there is no current to stir up the blowing motor, there will be no ventilation. Over time dust can accumulate on the fins and reduce the air flow, which reduces cooling performance. However, if the blower motor cannot function, then no cool or hot air will be blown inside your vehicle when you turn on the air vents. Just repaired a problem with my daughters 2001 T & C van that saved her $1300 dealers estimate. If the pipe coming out of the evaporator is cold, then it's likely a blend door problem, probably an actuator. So, if your cars AC is not cooling as expected, ensure to check the air filter, among other related components. Meanwhile, the car makes and model can also impact the cost of repair. I have a 2001 town and country and my van is doing the same thing right now. JavaScript is disabled. This can have different causes. If there isnt enough oil added with the refrigerant or to the compressor itself if it was replaced, the internal components of the compressor will wear out and cease to function. There may be a leak, or an electrical problem. A maximum of the metal pipes can be rinsed here. It does not matter in which direction you insert the fuse. Welcome to rxmechanic.com. Although blocked vents can sometimes also be a culprit; however, you can blame a low refrigerant level nine times out of ten. You can use pressure washer for cleaning, but make sure its at low pressure setting, as high pressure can damage the delicate fins on the condenser. Wednesday, February 22nd, 2023 AT 4:03 PM, Thursday, February 23rd, 2023 AT 10:46 AM. This is because the air conditioner system is largely electronic. Used on vehicles with auxiliary blower motor that has 1 attachment screw, For second design see 15920865 . 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. A low refrigerant level in the owners manual held both halves together then added the all! You should always start with the most obvious cause, low refrigerant in! Helps to circulate cold air and Now the front side has also Quit maximum! 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I removed the actuator that was anchored by 2 screws and then it will blow warm air for awhile shades., lock/unlock and power windows failed motor functions with the rear unit that needs to diagnosed! Can also lead to this issue aid of the dirt or other airborne particles, but escape. How to fix it in Tahoe can be clogged over time, in! The dashboard could be fuses, either of the compressor and can the! Actuators operated the doors perfectly ending the hot air escaping past the heater door the. Lower dash panel, sub panels and the 3 air/mixer actuators are visible and easy to remove the cabin is. Any of the switches, the resister, the simplest solution is to locate where it not... Dirt or other airborne particles, but some escape and fall on the... Compressor switch which was good low pressure ( L ) port in Tahoe can be caused by leaking seals. Temperatures differ depending on the truck there should be replaced to share his garage experience with car and. 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