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. This can be done, for example, with a vacuum cleaner or a compressed air system, removing at least a large part of the visible dirt particles. Front was not blowing air only the rear. I just paid a diagnostic for the AC. There are many reasons why your Chevy Tahoe AC is not cooling properly. As the name suggests, brake fluid is a hydraulic fluid typically used in a hydraulic braking system to supply pressure to the car wheels. - All You Need To Know. There is no prescribed time for changing cabin air filter, but most manufacturers recommend a change after 10,000-20,000 miles. I changed my compressor and the front ac was work but not the rear so I changed the orifice tube and the rear regulator valve and now the rear works but not the front I used 3 12oz Is this enought if not how many cans do I need to fill the system. The AC blower motor in Chevy Tahoe needs electricity to work. 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. There is no prescribed time for changing cabin air filter, but most manufacturers recommend a change after 10,000-20,000 miles. If this motor fails, there will be no flow of air through the vents of your vehicle. 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. If the fuse is blown, replace it with a new one with the specified amp rating. However, the high-pressure refrigerant pulls these chips back with it during operation and the next damage is inevitable. 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. 2007-2014 Tahoe / Yukon / Escalade Models, General Tahoe/Yukon/Escalade Discussion Forum. So, this article is a straightforward guide to help you ascertain the causes of the problem and how to fix them immediately. However, lets consider one aspect of the problem, which is the common reason why a cars front AC fails to work. Chevrolet Tahoe. Used on vehicles with auxiliary blower motor that has 1 attachment screw, For second design see 15920865 . Nothing happening in back. I have an 2000 chevy tahoe limited old body style 2w drive, 5.7 liter. Thanks for any help! If the refrigerant level goes down again quickly, then it means there is probably a leak. After replacing the battery, the motor idled a little bit rough for a few seconds, but then normalized. 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. February 2007 I have a 2001 Tahoe which also had fan problems. Had the compressor replaced in Aug 07. Therefore it is recommended to do this at a workshop. I have a 2007 chevy Tahoe. You can use these common factors to properly investigate the actual cause of your vehicles vent problems. To successfully detect the cause of a faulty air ventilation system, you need to check the various components of your vehicles ventilation system, which can be technical. link to Will Brake Fluid Remove Paint? The screen and all functions appear to be working, but the fan will Ask an Expert Car Questions Chevrolet Repair 1 1 Tom, ASE Certified Technician 30,957 Satisfied Customers Qualified to repair all makes and models. In most cases, the entire dashboard has to be removed before you can access the evaporator. A defective sealing ring, a worn line or a condenser that has been damaged by a stone chip are the most common causes. 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 would like to get this issue fixed. Also, over time the bearings of the blower motor can lose their initial lubrication and begin to dry out, causing increased friction in the motor. Insufficient amount of refrigerant is still the main cause of a non-functioning AC system. #A cabin filter is found in most vehicles ventilation systems; this filter helps to clean the air before it leaves the vents of your vehicle. Just repaired a problem with my daughters 2001 T & C van that saved her $1300 dealers estimate. The intake system helps to collect air from outside the vehicle and circulate it through the air conditioner system. If you are lucky, the wiring diagram will be drawn on the facing. 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. Simultaneously my oil/fuel/engine temperature/ and voltage gauges stopped working, AC stopped blowing cold, lock/unlock and power windows failed. If there is no current to stir up the blowing motor, there will be no ventilation. The air filter helps to trap dirt, dust, and other contaminants from accessing the HVAC system. She returned it to dealer and they pulled code that required pulling dash to replace air/mixer actuator. 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. There can also be a refrigerant leak in the evaporator, in that case the evaporator will have to be replaced. 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Therefore, if you have a faulty cooling fan, it will impact the condenser negatively and result in some sort of HVAC system malfunction. Make sure to glue and seal the darker piece (air cap) to the lighter (headliner) Sep 2, 2011. 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. This may be a situation of leaving the system dormant throughout winter only to start using it again in summer. In such a case, almost the entire air conditioning system has to be replaced. This hinders the condensers ability to release heat as less air passes through the mesh, which results in poor cooling in the cabin. your help is truly apprietiated. This is because the air conditioner system is largely electronic. If the resistor module develops a fault, it can cause the blower motor to stop working. However, if you dont turn on the air conditioning on your Tahoe for a long time, the parts will stick. This challenge can be overwhelming when you cant figure out what could be wrong. This guide will solve any ventilation problems in minutes, whether the air only blows through the front seat or other similar issues. Over time dust can accumulate on the fins and reduce the air flow, which reduces cooling performance. Both of these are at risk of clogging due to contamination, for example due to metal shavings from a failing compressor. Yes, the blower motor can still be operative after the resistor goes bad, but it may only work at high speed, or remain stuck at one fan speed. Meanwhile, if you know someone who is having this challenge right now, kindly recommend this article to them immediately. The compressor is the heart of the air conditioning system in Chevy Tahoe. First of all, you must ensure that you prevent your cars AC compressor from going bad. With the ac on and the compressor not running, lightly tap the switch with a wrench of something, just not too hard. I have the same problem in a customer's 2000 T&C. 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. New to this thread and having the EXACT same issue. The condenser receives proper cooling from the fan to convert the high-pressure gas it receives from the compressor into liquid. Once the leak has been found, this must be closed again by replacing the respective component. Pro Tip It is imperative the resistor module is checked. To begin troubleshooting, you must first connect the diagnostic tool to your Tahoe. If the component is clogged, kindly clean or replace the air filter. Few factors can affect the functionality of the blower motor like electrical problems, aging, etc. JavaScript is disabled. No not a problem. This motor is a fan located behind the dashboard responsible for blowing the air through the vents. Well if you have another car to drive while your tahoe is MIA, i would recommend that. What could be the problem". Instead of changing the cabin air filter in Tahoe, it is often recommended to first clean the filter. I have a brand-new battery and alternator in it. The following solutions will fix the problems outlined above. A damaged belt can also lead to this issue. The dealer said it was a modulator. Take it from a guy that has been on both sides. 232,000 MILES. The blower motor is a very important component of your vehicles ventilation system. 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 will need recharging after every few years. Blend door actuator plays a role in controlling the air flow and temperature inside your Tahoe. No air, no sounds NOTHING. The refrigerant is designed to work in synergy with the compressor within the air conditioning system. 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. I turned the ac switch off and proceeded to work with the windows down. 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. 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. 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. 0 answers. Immediately you are done with this, you will notice a better performance of your vehicles ventilation system. Unfortunately, this procedure does not allow you to get into the deeper layers of the filter. 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. The AC control heads are notorious for going out. Could this be the ac control switch on the dash? Shake the canister briefly and release the refrigerant into the system until the recommended pressure has been achieved. There are two ports in the air conditioning system of Tahoe. Even after the a/c was recharged. The blow fan can not be heard In the front ac when it quits, but again, the rear still works fine during this. The sound is something like a light tapping on the door and it typically happens when you turn on/off the air conditioning system or start the engine. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. The output voltage on the multimeter should read around 12 volts. 2002 Tahoe AC Front & Rear Solved: How much freon? Just have it refilled and you can drive with pleasant temperatures again. One is labelled H for high-pressure and the other one is labelled L for low-pressure. Sep 30, 2008 #3 T tspain Full Access Member Joined Apr 16, 2008 Need to fix your car's air conditioner? 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. 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. 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So, if your Chrysler Town and Country AC is not blowing or the front AC fails to work, implementing the solutions above may be helpful. So, I took the time to develop this article to educate you on what to do when you have an air vent problem. If these intakes become blocked or clouded by debris or other substances, it will stop the flow of air through your vents. Typically relays are located in the engine compartment or under the steering wheel on the left-hand side. 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. 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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. The two most prominent symptoms of a clogged up evaporator on your Tahoe are: Cleaning the evaporator on Tahoe is not a simple task. For this you normally have to remove the front bumper to gain access to the condenser. When the refrigerant leaks again, the leaking component will shine under UV light. I have a 2005 4.8L Tahoe. Welcome to rxmechanic.com. The information may be listed in your vehicles owners manual. The corresponding solutions have also been unveiled simultaneously. I have already checked freon and it is fine. Dirty evaporator can also be the reason for AC problems on your Chevy Tahoe. If the compressor comes on with the switch connector jumpered, then either the switch is defective OR the refrigerant system is low on freon. This problem has been reported to cause fires under the hood. It is important for you to properly diagnose the actual cause of the problem before acting. 2005 CHEVROLET TAHOE. 1995 Chevy Tahoe 6 Cyl Automatic 200000 Miles Without the cooperation of this component, the refrigerant wont be able to circulate cold air properly. A bad connector on the blower motor or the resistor module, or on the climate control unit can interrupt power supply to the blower motor in Tahoe. Is it blowing out of the defrost, or the floor, or where? An overcharged system not only affects cooling performance but can also damage the compressor and sometimes can cause a major leak. I done a handful of them at work. The dealer said it was a modulator. Various lights flickering is a symptom to look at for that problem and this could cause the compressor not to engage. The thumbwheel can be responsible for air not blowing hard out of car vents, but if this doesnt work, then the fault is not from the control vents but make sure you clean the dust or debris that has been accumulated in the vents as this can also affect the flow of air inside your vehicle. The blower motor is the central component of the air conditioning system in Tahoe, responsible for blowing cold air through the AC vents. 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. 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. I also tested the compressor switch which was good. In addition to the vehicle make, model, and engine type, you usually also have to type in the Vehicle Identification Number (VIN). The air conditioning system in Chevy Tahoe 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. A failed condenser can prevent cool air from flowing through your vents. 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. When this happens, you may hear unusual whirring or droning noises from behind the dashboard. Instead of changing it directly, it is often recommended to first clean the pollen filter. My Air Conditioner cools fine and then it will blow warm air for awhile. Airflow control diverters or flaps AC vents issue is one of the culprits of this problem. The vacuum is created by the engine while driving. Smaller holes have to be localized by searching all components with a gas detector. 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. You can try disconnecting the battery cables and touching them together for a minute or two. 2007 Tahoe. In case of severe contamination, multiple components may have to be replaced, including the condenser, the evaporator and the compressor. 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. In any case, ensure to contact an expert auto technician to diagnose the AC problem before opting for a repair or replacement of any component. The blend door actuator may require recalibration after replacement. 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. Sometimes changing the temperature can temporarily stop the sound. You will notice specks of dust and debris on its surface if you have not cleaned the filter in a long while. 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. With the tool connected, turn on the ignition. The Back A/c Blows Good And Is Cool But Not As Cold As Before. A knocking noise from behind the dashboard could be an indicator of a bad blend door actuator in your Tahoe. vents. (Merged). The ventilation system of your vehicle is connected with various hoses that transport fluid; if there is any damage to these hoses, the ventilation system will not be able to function properly. 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. Do you still sweat while driving your Chevy Tahoe? Refrigerant leak in Tahoe can be caused by leaking O-ring seals, leaking condenser or evaporator core, or a cracked hose. 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. I replaced the blower resistor (about $30.00 from Chevrolet Parts). If the pipe coming out of the evaporator is cold, then it's likely a blend door problem, probably an actuator. Proper diagnosis is the first step to fixing any of the problems above. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. Or did you purchase a vehicle in January and feel lucky you locked it in before prices rose higher through February? The HVAC system is designed to blow air from either the floor, mid or defrost You must log in or register to reply here. Stop blowing/no air flow from ac vents or even defroster vents, etc but the rear continues and is good. 0%. 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. Sometimes, a blown fuse or some sort of electrical fault may be responsible for the malfunctioning of the cooling fan. A worn out or weakened blower motor can also produce abnormal sounds when in operation. All models. A clogged air intake system may be the reason why your cars air conditioners front vents are not blowing out. This enables the air conditioner to produce cold air. I also carefully checked the fuses, and they are as they should be. If youre a DIYer, replacing this component can be pretty easy. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. 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