In other cases, the front AC may stop working with only the back AC working. A clogged air intake system may be the reason why your cars air conditioners front vents are not blowing out. A damaged belt can also lead to this issue. 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. The corresponding solutions have also been unveiled simultaneously. 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 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. 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. 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. Unplug the electrical connector from the blower motor. Hot or Cool air is blown into your vehicle through the air vents controlled by your HVAC system. Unfortunately, the refrigerant level can become low over time or due to leakage. I have a brand-new battery and alternator in it. 1. Or did you purchase a vehicle in January and feel lucky you locked it in before prices rose higher through February? The fuse is a very sensitive component in the HVAC system. If bite marks are discovered, carefully examine all the cables and hoses for damage, including electrical wires for the blower motor. 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. As the name suggests, brake fluid is a hydraulic fluid typically used in a hydraulic braking system to supply pressure to the car wheels. If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturers recommendation. Decisions, decisions. This can happen due to a leak or if the AC has not been recharged for a long time. 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. My Air Conditioner cools fine and then it will blow warm air for awhile. The mode doors are operated by a small electric motor/actuator. Just repaired a problem with my daughters 2001 T & C van that saved her $1300 dealers estimate. Relays are electromagnetic switches that are used to switch electrical loads on and off. A dirty filter causes the overall ventilation of the interior to deteriorate resulting in reduced cooling and air flow. A bad relay can also be the cause of AC blower motor failure in your Chevy Tahoe. 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. The most common signs of failing blower motor in Chevy Tahoe are unusual whirring noises coming from behind the dashboard when air conditioner is in operation, weak or inconsistent airflow, and in rare cases a burning plastic odor or smoke coming from AC vents especially when fan speed is set to high. My front air does not blow out (it works in the back). They replaced the compressor and no cold air still only warm air. However, my air conditioning will now only blow out of the defrost vents. Recharged With More Air Conditioning Problem It may not display this or other websites correctly. The blower motor relay is an electrical component that supplies current to the blower motor of your car. If only hot air comes out of the air vents in your Tahoe, then the problem probably lies somewhere else. However, if you cant do the job, you may have to contact a professional auto technician to do it. As a rule, there is no avoiding a change if the filter is dirty. Excessive oil can also reduce the performance of the compressor and can cause it to fail prematurely. When I got home I opened the hood and noticed the compressor was not engaged even though the switch was on and on Max / Hi. Instead of changing it directly, it is often recommended to first clean the pollen filter. joeydano Member Posts: 2 August 2011 Having the same problem, Front blower goes off with. You can try disconnecting the battery cables and touching them together for a minute or two. When looking for the reason, you should always start with the most obvious cause, low refrigerant level in the system. . Is it blowing out of the defrost, or the floor, or where? Otherwise no problems. 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. These two areas are very necessary for your vehicles ventilation system to properly function. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. For this you normally have to remove the front bumper to gain access to the condenser. The function of the blower motor resistor is to control the speed of the blower motor. You can use these common factors to properly investigate the actual cause of your vehicles vent problems. In the event of a defect, the mechanic can directly initiate the repair. Remember cruising downtown on a hot and sunny or driving on a snowy day, then suddenly your dashboard air vents are not working. Stop blowing/no air flow from ac vents or even defroster vents, etc but the rear continues and is good. The leak can be diagnosed by injecting small amount of fluorescent dye into the AC system. Over time, grime, bugs and other small particles can build up on its surface and in the gaps of its mesh. One of such malfunction is the impact it has on the air conditioners ability to cool properly. You are using an out of date browser. Could be fuses, either of the switches, the resister, the wiring or the blower motor itself. The air filter helps to trap dirt, dust, and other contaminants from accessing the HVAC system. I Can Only Get The Ac To Work In The Recycle And No The Fresh Air? 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. 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. The sound is something like a light tapping on the door and it happens when you turn on the air conditioning system or turn off the engine. The OBDII connector is usually located under the dashboard. 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. 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 otherwise it will short out and blow up the fuse, and may cause damage to the vehicles electrical system. No not a problem. The following solutions will fix the problems outlined above. Therefore, the filter performance will not increase significantly even after cleaning. It operates more than one door by moving levers when it rotates. Are you currently in the car market and getting discouraged by high prices? If your AC system is depleted on refrigerant this will not work Yes, that's it. Turn on the AC and set it to the coldest setting, and the fan speed to maximum. Either way if the compressor comes on it rules out the control head being the cause of the compressor not engaging. It would be best to contact an expert auto technician to diagnose and fix this problem as soon as possible. The AC vents are designed with open spaces to allow cold air to flow through into the car. Dirty evaporator can also significantly reduce AC cooling performance in Tahoe. Finding these mostly very small leaks is often not easy. You cannot repair a broken blower motor, the part must be replaced with a new one. The first area is the vents by the lower half of the windshield, and the second area is the air that is circulated again within the cabin of your vehicle. There are several causes for AC not blowing cold air in Tahoe, which we will go through in this article. This guide will solve any ventilation problems in minutes, whether the air only blows through the front seat or other similar issues. Check all the relevant fuses and relays related to the air-conditioning system in your Tahoe. However, you must ensure that you apply the correct solution to the accurate problem to get your desired results. And Yes, this can be used for most vehicles: Note that you have to be very careful in doing this; if this is not done properly, you might risk incurring more damages. If the refrigerant level goes down again quickly, it means there is probably a leak. As a rule, there is no avoiding a change. I have an 2000 chevy tahoe limited old body style 2w drive, 5.7 liter. Less common causes are clogged expansion valve or orifice tube, overcharged oil, faulty blend door actuator, or a defect in the climate control unit. 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. Failed condenser or compressor. However, using cheap or homemade cleaning tools can make the job easy. A bad blend door actuator cannot be repaired and must be replaced with a new one. Just like with low refrigerant, the AC in Tahoe will blow warm air only if the AC system is overcharged with refrigerant. The Front Air Vents Are Not Blowing At Idle In My 2007 Chevy Tahoe. You must replace it with one of the same amperage and therefore the same color. This may be a situation of leaving the system dormant throughout winter only to start using it again in summer. 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. Re-installed the actuator. The operations can be altered by a simple electrical fault, especially a blown fuse. Over time dust can accumulate on the fins and reduce the air flow, which reduces cooling performance. Did you ever figure out what was wrong with your van? In case of a faulty fuse, the circuit is interrupted and the motor can not work. The dealer said it was a modulator. But I would make the shop that did the work fix it for ZERO. The HVAC system is designed to blow air from either the floor, mid or defrost 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. Less common causes are clogged expansion valve or orifice tube, overcharged oil, faulty blend door . 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. However, lets consider one aspect of the problem, which is the common reason why a cars front AC fails to work. After cleaning up the dust or dirt, carefully wipe the vents with a dry towel. She returned it to dealer and they pulled code that required pulling dash to replace air/mixer actuator. THE SAME PROCEDURE IS USED FOR A TAHOE OR. 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. Simultaneously my oil/fuel/engine temperature/ and voltage gauges stopped working, AC stopped blowing cold, lock/unlock and power windows failed. The result is a defective compressor that can no longer be repaired. 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. After The First Stop, I Got Back In And It Was Blowing Warm Air. Simultaneously my oil/fuel/engine temperature/ and voltage gauges stopped working, AC stopped blowing cold, lock/unlock and power windows failed. I'm dumbfounded. #The air conditioning system consists of air control vents with a control door inside your vehicle on the dashboard. The most common causes for AC fan blower motor not working in Chevy Tahoe are blown fuse, bad relay, resistor or control module malfunction and faulty blower motor. Insufficient amount of refrigerant is still the main cause of a non-functioning AC system. The most common causes for AC fan blower motor not working in Chevy Tahoe are blown fuse, bad relay, resistor or control module malfunction and faulty blower motor. Firstly, take out time to inspect your cars AC vents on the dashboard. 2007 CHEVROLET TAHOE V8 2WD AUTOMATIC Front ac works fine but rear is blowing hot. Quite often the door will get jammed at one end. You should take your vehicle to the mechanics shop for this replacement because doing this can be very technical. I turned the ac switch off and proceeded to work with the windows down. Since Chevy Tahoe is equipped with on-board diagnostics (OBD), a fault diagnosis can provide initial indications of where the malfunction is located in the air conditioning system. In order to do this, you must run the air conditioner on full blast at least once, around 15 minutes every three weeks. So, if youre battling this issue in your car at the moment, ensure to implement the recommended solutions above. So I know that after you let the vehicle sit for hours on end the ac will work for 10 minutes or so then quit blowing cold air. The output voltage on the multimeter should read around 12 volts. That's an impressive piece of work :shades: . Larger leaks may already be heard or you can find them with a leak detection spray. During winter, the vehicles heater is needed to function optimally due to the very cold environment as opposed to summer. I scuffed the cavity and drilled 1/8 inch holes in the cavity and the other broken half piece. If the metal strip is broken in the middle, the fuse has blown. The most common symptom of a faulty blend door actuator in Chevy Tahoe is a slight clicking sound (or other unusual noise) repeatedly coming from under the dashboard. 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. Home Troubleshooting Chevy Tahoe AC blower motor not working causes and diagnosis. Could this be the ac control switch on the dash? But before you begin the replacement, it is highly recommended to disconnect the vehicles battery.Note: Vehicles with auto climate control may not have a blower motor relay. #The ventilation system of your vehicle has two air intakes. Therefore it is recommended to do this at a workshop. 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. You can also use dry brushes for this purpose but remember, you have to do this gently. If found dirty, clean it using a brush. Make sure to glue and seal the darker piece (air cap) to the lighter (headliner) Sep 2, 2011. Cabin air filter captures most of the dirt or other airborne particles, but some escape and fall on to the evaporator. I have a 2003 Chev Tahoe z71 with 88,000 miles. Immediately you are done with this, you will notice a better performance of your vehicles ventilation system. I am frustrated and stuck. 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. 0%. 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