Insufficient amount of refrigerant is still the main cause of a non-functioning AC system. Also, you may physically spot dust build-up when you carefully look through the vents. 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. The most common symptom of faulty blend door actuator on Chevy Tahoe is a slight clicking sound repeatedly coming from under the dashboard. Do this without fail, irrespective of whether it is winter, spring, or summer. No air, no sounds NOTHING. 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 ventilation system of your vehicle has two air intakes. After cleaning up the dust or dirt, carefully wipe the vents with a dry towel. Due to the complexity of the replacement job, it is not recommended as a DIY project. If there is no current to stir up the blowing motor, there will be no ventilation. Pro Tip It is imperative the resistor module is checked. 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. 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. I KNEW the AC system was properly charged before I attempted this. This might lead to a point where the air conditioner starts blowing hot air. 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. . You see, that was not so difficult. 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. 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. Could this be the ac control switch on the dash? 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. 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. - All You Need To Know. If the fuse is blown, replace it with a new one with the specified amp rating. 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 replacing the battery, the motor idled a little bit rough for a few seconds, but then normalized. link to What is Inside a Catalytic Converter? Just have it refilled and you can drive with pleasant temperatures again. THE SAME PROCEDURE IS USED FOR A TAHOE OR. Z. You have to know that you cannot use the heater or air conditioner in your vehicle if your air vents are clogged or blocked. If this is the case, the only option is to replace the broken part. 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. This is the case regardless of whether the system is set on "auto" or whether you manually select the vents (i.E. To begin troubleshooting, you must first connect the diagnostic tool to your Tahoe. 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. Meanwhile, the car makes and model can also impact the cost of repair. Re-installed the actuator. However, if you cant do the job, you may have to contact a professional auto technician to do it. 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. Therefore it is recommended to do this at a workshop. Over time, these dust particles can builds up on the fins and block the air flow through the evaporator, resulting in poor cooling. If the ground is in good condition, you should be okay but if you want to check the power and grounds of all circuits to the BCM this guide can help along with the BCM wiring diagrams above to help confirm the failure before you order one. #A blower motor is regulated by a switch inside the vehicle or, most times, by a computer. Could be fuses, either of the switches, the resister, the wiring or the blower motor itself. It is important for you to properly diagnose the actual cause of the problem before acting. I noticed the heater core door actuator was working but the plastic cam was broken. #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. Immediately you are done with this, you will notice a better performance of your vehicles ventilation system. link to Will Brake Fluid Remove Paint? In case of severe contamination, multiple components may have to be replaced, including the condenser, the evaporator and the compressor. The corresponding solutions have also been unveiled simultaneously. It is not only responsible for pumping the refrigerant throughout the AC system but also converting the refrigerant from gaseous state to liquid state as it passes through the condenser. The blow motor functions with the aid of the blower resistor. If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturers recommendation. Chevrolet Tahoe. Aside for checking the system for fault codes, I would suspect a faulty blend door actuator, or faulty expansion device. 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. I know this is probably a long shot, given the time stamp on the post, but what was the outcome on this? 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. Air conditioner front automatic auxiliary control (CJ2), air conditioner front manual auxiliary control (CJ3), rear auxiliary air conditioner (C69). 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. This can shock the system and damage it. If I could save the $ on the diagnostic test, that would be great! In other cases, the front AC may stop working with only the back AC working. 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. Over time, grime, bugs and other small particles can build up on its surface and in the gaps of its mesh. The HVAC system is designed to blow air from either the floor, mid or defrost If you are a DIYer, ensure to get a voltmeter to test for the blown fuse in order to replace it. When looking for the reason, you should always start with the most obvious cause, low refrigerant level in the system. 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. I have read that the output directly at the vent should be about 40-50 when in good shape (Please correct me if I . This problem has been reported to cause fires under the hood. 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. The air conditioner in my 2007 chevy tahoe LTZ is not working properly. Will this last forever? This process cleans the air that flows into the air conditioning system before it circulates. I also tested the compressor switch which was good. In some cases, this malfunction can result in your Acura MDX rear AC blowing hot air. 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. There are many reasons why the AC blower motor may not be working in your Chevy Tahoe. I am frustrated and stuck. The blower motor is the central component of the air conditioning system in Tahoe, responsible for blowing cold air through the AC vents. Anytime there is a problem with the temperature of the air conditioning system, it could be a problem with the blend door actuator. 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. 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. Hi in this video I will show you how to confirm the fix on you vent no blowing air 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 just paid a diagnostic for the AC. 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 blow fan can not be heard In the front ac when it quits, but again, the rear still works fine during this. your help is truly apprietiated. Like the radiator, the air conditioning condenser on Chevy Tahoe sits at the front of the vehicle and is responsible for releasing the heat from the refrigerant into the ambient air. You must replace it with one of the same amperage and therefore the same color. Cabin air filter captures most of the dirt or other airborne particles, but some escape and fall on to the evaporator. If the resistor module develops a fault, it can cause the blower motor to stop working. Continue reading this article to know of a proper guide that will help you successfully fix that air ventilation problem of yours. The condenser receives proper cooling from the fan to convert the high-pressure gas it receives from the compressor into liquid. The compressor is the heart of the air conditioning system in Chevy Tahoe. The vacuum is created by the engine while driving. 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. The AC vents are designed with open spaces to allow cold air to flow through into the car. 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. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. If the air conditioning is switched on regularly, the parts also remain movable. The operations can be altered by a simple electrical fault, especially a blown fuse. Warning: Wear gloves and safety glasses before recharging the AC to avoid accidental exposure to harmful chemicals in the refrigerant. Would a clogged evaporator hose cause it? Sometimes, a blown fuse or some sort of electrical fault may be responsible for the malfunctioning of the cooling fan. Check the owners manual of your vehicle or the fuse box cover to find the exact location of the AC fuses. When the battery is disconnected and reconnected, many of them go through a calibration sequence to determine the full range. Where is the air blowing when you are moving if it's not blowing through the vents? Most vehicle control doors have control to prevent you from damaging the door; this control is called a thumbwheel. The refrigerant pressure is affected by the outside atmospheric temperature. - All You Need To Know. What could be the problem". Dash vents, floor vents, defrost, etc). 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. Take it from a guy that has been on both sides. 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