Question about 1997 Chevrolet Tahoe

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Vent controls wont work. a/c also wont turn on

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VENT PROBLEM: Check the vacuum line that feeds vacuum to the heater control unit. This vacuum line goes through the firewall to the heater unit.  Safely rise front right side of the car. Take a look under the car's fender - under fender, front of the tire. Check the VACUUM line leading to the small TANK . If the rubber connection to the tank is broken or leaking, fix it. If everything checks out ok then the controller needs to be replaced. Vac to the control head or bad control head. A/C PROBLEM:- Troubleshooting a car air conditioner . There are specific parts of the air conditioner system that has to be checked to locate the fault. 1) Freon:-- First, there is the compressor that pumps the Freon (a gas and liquid combination) through the a/c system. The Freon goes through expansion valves where the gas/liquid combination expands or contracts based on how much air conditioning is needed. The cold Freon then goes through an evaporating core where the cold air it creates is released into the car creating air conditioning. The Freon not only helps create the cool air, but it also aids in retracting the hot air in the car. 2) Decreased Airflow across Condenser:--Make sure that the fan unit is working when the a/c is turned on. If you do not hear a motor running when the a/c is turned on, that could mean the fan is burnt out, or that the motor is dying out. 3) Overheating problem:-- It is common, on especially hot days, for the air conditioning unit in a car to overheat due to the a/c unit’s excessive amount of work. There are typically two units of cooling in every car. There is the air conditioning condenser cooling system and the radiator cooling system. Although one is specific to the a/c unit, the car itself can overheat when it is worked too hard. Check both, to make sure that one has not interfered with the other. On hot days, both cooling systems tend to work, making it more likely for the a/c cooling system to overheat and burn out. These are detectable by running the car and listening for off beat sounds and by taking a closer look at each unit.
4) And the last thing if all the above mentioned possibilities checked out ok. Then its the fault in a/c wiring's and main control module which power the a/c unit of the car.It needs to be checked by technician.
Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

Posted on Jun 05, 2010

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