Wiki User
∙ 2008-01-07 13:23:13I have the identical problem on a 1991 Jimmy. I have replaced the blower motor and flushed the heater coil. I know the vents are working properly because they work when the temperature is selected to cold. I am wondering if there is something under the hood that redirects the aif flow either through the cooling coil or the heater coil based on the position of the temperature control. If so possibly the heater coil (air side) is clogged. I noticed that the heater coil is below the AC coil so it is possible that debris is down in it. I may try to pull it and clean it. Have you tried that?
Wiki User
∙ 2008-01-07 13:23:13Did you happen to move it to Defrost when you turned it off? The ac compressor also runs in the defrost cycle to keep the seals lubricated during the winter months when the ac is not used.
when the defroster is turned on, it activates the a/c compressor. the clutch may be locking up on the compressor.
the number 6
The A/C system compressor operates when in the defrost mode. If the noise is also heard when running the A?C it is more than likely a problem with the compressor/pulley.
you probably have a leaking heater core....you can replace it or bypass it
Sixty eight.
6
i just replaced the thermostat in 2004 Chevy truck heater works fine now
Yes. This increases its volume, which results in a decrease in its density.
Answer Maybe you aren't turned on sexually, but who knows what thoughts are going on in your head.
It is not supposed to be on when engine is running unless there is a problem.
DO NOT FEAR THIS !!! The ac comes on with the defrost: because do you ever use your ac in the winter? me neither. Manufactures have made the ac come on with the defrost to prevent the ac compressor from seizing up. Since we never use them in winter, at least in cold climates. Cheers and drive on.