Thanks for any help! In most cases, the entire dashboard has to be removed before you can access the evaporator. 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. There are many ways to test a resistor, but the most easiest and basic method is to check the voltage at the electrical connector on the blower motor with a multimeter. You cannot repair a broken blower motor, the part must be replaced with a new one. In this way, it can be determined whether the loss of refrigerant is due to a defective condenser. A functioning ventilation system is needed in most modern vehicles for comfortability while driving. Anytime there is a problem with the temperature of the air conditioning system, it could be a problem with the blend door actuator. If one side of your cars AC is not working, the car is most likely running on a low refrigerant level. However, if you cant do the job, you may have to contact a professional auto technician to do it. If this is the case, you can start with the fuses at the underhood fuseblock. All models. Remove the electrical connector from the blower motor. Relays are electromagnetic switches that are used to switch electrical loads on and off. The blower motor is the central component of the air conditioning system in Chevy Tahoe, responsible for blowing hot or cold air through the AC vents. In order to do this, you must run the air conditioner on full blast at least once, around 15 minutes every three weeks. You are using an out of date browser. Fix an Air Conditioning Not Working Video. The condenser and the cooling fan also work in synergy within the air conditioning system. For a better experience, please enable JavaScript in your browser before proceeding. Not exactly sure what I am looking for. . Reconnect and see if the behavior changes. Theres practically no problem we wont be able to solve. It does not matter in which direction you insert the fuse. Set the amp motor to run at full speed, and when you do this, the amp meter is supposed to read between 8 to 15amps. 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. With that being said, you or someone else may have mistakenly closed these components on the dashboard; hence, the AC not blowing out in front vents. A broken compressor is usually irreparable. This hinders the condensers ability to release heat as less air passes through the mesh, which results in poor cooling in the cabin. Climate control module is the brain of the air-conditioning system in your Chevy Tahoe, responsible for controlling all the components in the system. I Checked The 25 Amp Fuse Still No Blowing In Rear Of Car. Over time, grime, bugs and other small particles can build up on its surface and in the gaps of its mesh. - All You Need To Know, How to Jump AC Compressor Clutch Correctly. Your vehicles air conditioning system has an expansion vale or an orifice tube, depending on the model. Front was not blowing air only the rear. If the compressor comes on with the switch connector jumpered, then either the switch is defective OR the refrigerant system is low on freon. Cabin air filter captures most of the dirt or other airborne particles, but some escape and fall on to the evaporator. A knocking noise could be another indicator of a bad blend door actuator on your Tahoe, although its quite rare. When you turn on the AC fan in your Tahoe, and the air does not flow out of the vents, or the airflow is poor or inconsistent, it could be due to a broken blower motor. You can use these common factors to properly investigate the actual cause of your vehicles vent problems. It also puts unnecessary strain on the entire AC system which negatively impacts the fuel consumption. There is no prescribed time for changing cabin air filter, but most manufacturers recommend a change after 10,000-20,000 miles. 37 % of the time it's the. I turned the ac switch off and proceeded to work with the windows down. However, a bad electrical connector or broken wire, or a defect in the climate control unit can also cause the blower motor to stop working. Proper diagnosis is the first step to fixing any of the problems above. . By knowing this, you have been able to acquire some DIY auto-repair skills. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. If the refrigerant level goes down again quickly, it means there is probably a leak. Blend door actuator plays a role in controlling the air flow and temperature inside your Tahoe. You can also use dry brushes for this purpose but remember, you have to do this gently. 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. Few factors can affect the functionality of the blower motor like electrical problems, aging, etc. 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. Because it cost nothing but time. 2007-2014 Tahoe / Yukon / Escalade Models, General Tahoe/Yukon/Escalade Discussion Forum. The inside of the vehicle is developing a bad moldy smell. It is located on. However, the cost can be more depending on whether you have to replace faulty components like the compressor, sensor, condenser, or hose. This is the case regardless of whether the system is set on "auto" or whether you manually select the vents (i.E. 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. You must replace it with one of the same amperage and therefore the same color. #5. Dressed it with a file and sand paper checking it for clearance in the male spline on the shaft and installed it after it setup. You have an electrical issue with the rear unit that needs to be diagnosed. This information is typically located under the hood and/or in the owners manual. Just like with low refrigerant, the AC in Tahoe will blow warm air only if the AC system is overcharged with refrigerant. Excessive oil can also reduce the performance of the compressor and can cause it to fail prematurely. I scuffed the cavity and drilled 1/8 inch holes in the cavity and the other broken half piece. If you do not see any volts, or if you only see volts at certain fan speed setting, it could be due to a bad resistor. Insufficient amount of refrigerant is still the main cause of a non-functioning AC system. Be the first to answer Jun 11, 2017 2007 Chevrolet Tahoe. If the motor does not spin after directly connecting to the battery, it confirms that the blower motor is dead and should be replaced with a new one. Once or twice I have noticed smoke blowing out of the vent for a few seconds. Meanwhile, a prolonged clogged AC vent may eventually lead to overheating within the air conditioning system and cause the HVAC system to completely shut down. With the ac on and the compressor not running, lightly tap the switch with a wrench of something, just not too hard. While some cars AC problems can consume as much as $1000 $4,000, others may fall within $163 $520. With the tool connected, turn on the ignition. 2007 Tahoe. If this is the case, carefully clean the vents with detergent and water solution using a foam paintbrush. You see, that was not so difficult. When your cars air conditioning systems refrigerant is low, it will automatically alter the temperature circulation from one end of the dashboard to the other. The compressor is the heart of the entire air conditioning system on Chevy Tahoe. A professional mechanic can swiftly diagnose the issue for you. Well if you have another car to drive while your tahoe is MIA, i would recommend that. Home Troubleshooting Chevy Tahoe AC not cooling causes and diagnosis. I removed driver lower dash panel, sub panels and the 3 air/mixer actuators are visible and easy to get to. 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. Once you confirm it, kindly remove the blown fuse and replace it. The only thing that helps is swapping with a new one. 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. Note: Dirty cabin air filter mostly only leads to reduced cooling. I also tested the compressor switch which was good. Most diagnostic devices then ask for some information about the vehicle. A maximum of the metal pipes can be rinsed here. Osuagwu Solomon is a certified mechanic with over a decade of experience in the mechanic garage, and he has over five years of experience in the writing industry. Over time, these dust particles can builds up on the fins and block the air flow through the evaporator, resulting in poor cooling. The rear work fine. You must log in or register to reply here. 232,000 MILES. Therefore, the filter performance will not increase significantly even after cleaning. Therefore, if you have a faulty cooling fan, it will impact the condenser negatively and result in some sort of HVAC system malfunction. If you dont have the system serviced for a long time on your Tahoe, the refrigerant level will eventually get so low that the system loses its cooling capacity. Welcome to rxmechanic.com. The refrigerant pressure is affected by the outside atmospheric temperature. (Merged). Turn on the AC and set it to the coldest setting, and the fan speed to maximum. After cleaning up the dust or dirt, carefully wipe the vents with a dry towel. 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. I have a 2007 chevy Tahoe. If the condenser is damaged or blocked, it can cause your car to overheat while the AC is on due to inadequate air flowing to the air conditioner. Does anybody know if there are 2 separate blower motors for the front and rear AC blowers? 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. Follow this procedure after youve ruled out any problem with the blower motor fuse or relay. Re-installed the actuator. If you are only topping off the refrigerant in your Chevy Tahoe 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. Aside for checking the system for fault codes, I would suspect a faulty blend door actuator, or faulty expansion device. This can shock the system and damage it. This might lead to a point where the air conditioner starts blowing hot air. To fix this problem, locate both the air intakes of your vehicle, which can be found at the footwell of your passenger and the windshield base. Refrigerant leak in Tahoe can be caused by leaking O-ring seals, leaking condenser or evaporator core, or a cracked hose. 0 answers. It is important that you enter this 100% correctly, otherwise the result of the search may be inaccurate. You will notice specks of dust and debris on its surface if you have not cleaned the filter in a long while. So, you will most likely experience a situation where the front AC blows cold, the rear AC blows hot, and vice versa. However, you can close or control the direction of the airflow. Another thing that could be the cause is the low pressure switch mounted on the accumulator. Figure 1. Locate the blower motor in your Tahoe, typically located under the passenger side dashboard. 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. 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. 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. Check all the relevant fuses and relays related to the air-conditioning system in your Tahoe. 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. In addition to the normal loss, component defects are usually responsible for the escape of the refrigerant gas on Chevy Tahoe. So, this article is a straightforward guide to help you ascertain the causes of the problem and how to fix them immediately. A worn out or weakened blower motor can also produce abnormal sounds when in operation. Therefore, ensure to check for a bad relay or blown fuse within your cars electrical system. It would be best to contact an expert auto technician to diagnose and fix this problem as soon as possible. You do not have to remove the dash. There are many reasons why your Chevy Tahoe AC is not cooling properly. If the resistor module develops a fault, it can cause the blower motor to stop working. Some filters are found under the bonnet of some vehicles, while some are located under the vehicles passenger seat. But I would make the shop that did the work fix it for ZERO. Therefore, the filter performance will not increase significantly even after cleaning. 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. Both of these are at risk of clogging due to contamination, for example due to metal shavings from a failing compressor. A leaking condenser can lead to a loss of refrigerant and reduced cooling performance of the system. If the blower motor stops working due to a fault, the air will not flow out of the vents when you switch on the AC in your Tahoe. If the condenser is dirty on your Tahoe, the simplest solution is to clean it. It can even result in unnecessary financial wastage if you suddenly replace components that are not necessarily the issue. Sign in or register to get started. This can have different causes. The air conditioner in my 2007 chevy tahoe LTZ is not working properly. Do this without fail, irrespective of whether it is winter, spring, or summer. You can recharge your AC through the low-pressure port with a do it yourself AC recharge kit. Use the thumbwheel to start and stop the airflow. Of course, a blown fuse can cause a cars AC not to work. 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. 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. joeydano Member Posts: 2 August 2011 Having the same problem, Front blower goes off with. My Air Connditioner Is Not Cooling. The worst damage, however, is a failure of the AC compressor when it eats itself due to insufficient lubrication or a production error, metal chips form, which are distributed throughout the Tahoes AC system. In some cases, this malfunction can result in your Acura MDX rear AC blowing hot air. Sometimes changing the temperature can temporarily stop the sound. 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. If the pressure is higher than the recommended pressure, let some refrigerant out preferably into a rag to avoid exposure. Then carefully remove the debris or substance blocking these intakes. Prior to the battery going dead, I had no problems with the AC. What could be going on? Therefore it is recommended to do this at a workshop. 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. A failed condenser can prevent cool air from flowing through your vents. Need to fix your car's air conditioner? This enables the air conditioner to produce cold air. 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. Electronic climate control module on Amazon https://amzn.to/2YSz4VlManual climate control module on Amazon https://amzn.to/31C28lZOn a 03-07 Chevrolet/ GMC . I have read that the output directly at the vent should be about 40-50 when in good shape (Please correct me if I . 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. Additionally, a damaged wire in the circuit, including the wire from the fuse box, can also cause the blower motor to stop working. You can try disconnecting the battery cables and touching them together for a minute or two. Ugh. It is not easy to clean through the narrow spaces of your vehicles air vents thoroughly. You dont necessarily have to visit a workshop to clean or replace the pollen filter on your Tahoe. My battery keeps dying also, and I have to have it jumped almost every day. When you have a clogged air conditioner vent, the difference in temperature circulation will make a part of the car cold while the other becomes hot. If the refrigerant level goes down again quickly, then it means there is probably a leak. Some of the common reasons why youre experiencing a situation offront AC not working but back ishave been exposed in this article. There may be a leak, or an electrical problem. 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. If I could save the $ on the diagnostic test, that would be great! You should have it checked by a certified AC repairman. Do you think it is 100% the BCM or should I really do an in-depth check of that ground? 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