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My car was making a noise when you would turn on the air or heat. The noise stopped and now i have very small amount of heat and air blowing only when I drive.
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While your driving, the pressure of air from the outside will actually blow a small amount of air through your system. When your stopped = no air pressure = not much heat.
Your cars blower motor is probably shot from moisture and you should check the resistor also as it runs all the speed functions of the blower motor regards Chris
It sounds like your AC unit could be overheating or even damaged.
AC units have a sensor that will turn them off automatically to prevent damage from overheating. If there is an insufficient amount of air flow, the unit will heat up, and then eventually turn off.
When the car is moving, more air is forced over the unit, likely keeping it cool enough to run, however, when the car come to a stop, it loses that air flow, and quickly heats up. Thus, the AC would work while the vehicle is in motion, and overheat and stop when the car is stopped and idling.
However, the AC unit could be completely blown. The cold air while moving could be just a case of air being forced into the car. Think of a house fan, the fast the wind blows on you, the cooler it gets.... Thus, it could be an illusion that the AC is working when car is in motion, when it really isn't.
If the weird noise is like a coffee grinding machine, the a/c compressor is shot. If the noise goes away when you turn off the a/c, it confirms compressor trouble. If there is a screeching noise when you rev up the engine, it could be that the a/c belt has too much slack and is not turning over the compressor. Heat production and management has nothing to do with the a/c, it is a separate system,
Turn the AC/heater dial to the right ... not left...
(clockwise, not counter-clockwise)
Turn temerature knob to the RED marking..
You should hear a clicking noise ... then HOT air...
Also: The heater core may be clogged.... Use radiator flush to clean out cooling system.
Your blower motor could be "clogged" but I never saw one with enough debris in there to actually make one stop/ The cure for both is to remove the blower motor from the air box. if you find tons of leaves in there, clean them out. If the shaft on the motor has lots of side play, or will not run when connected hot to battery, replace it.
I had problems with a similar truck,a 1998 GMC diesel after checking to make sure the control cables were operating the blend door and blowing the mess of the heater core,I replace the thermostats.Still no heat turns out there was a small amount of debris collecting in the fitting for the inlet hose at the thermostat housing after removing it and blowing out the lines the heat was fine.
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