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If you have electronic automatic temperature control, press and hold off and floor buttons at the same time, with key in the on position, then release and press auto for 1 second.this will put system into self test. If numbers come up,152-52-32- 132-or some code, Google it..most likely the blend door actuator,some have found a way to do it without removing dash at s much lower cost.
Hopefully they put a receiver dryer when they changed the compressor. If so you may just be out of Freon. If the a.c. hoses were not changed they can leak too.
Not sure if I'm too late to answer this one, but you're describing a low refrigerant condition. The hissing noise and constant cycling of the compressor clutch are indicators of that. You should recover the system, record how much refrigerant was recovered, evacuate the system (with a vacuum pump), add A/C dye, and recharge the system to capacity. Common leak areas on these vehicles include the A/C condenser (located in front of the radiator), and the evaporator (located inside the dash, and requires complete removal of the interior dash to replace it). If you can't find a visible leak after running the recharged system with dye for several weeks and it starts to blow warm again, you will need to use an R-134a leak detector to "sniff" areas of the system for a refrigerant leak.
There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,
need more info ------------- year //make //model --------- sounds like a/c relay not energizing , which the ground side is controlled by the ecm or bcm . ---- possible bad relay // wiring // fuse// compressor
It's normal for the A/C compressor to come on with the defroster to dehumidify the air so the windsheild won't fog up under humid conditions. You can still control the air temp. out the vents with the temp. select switch.
sound like ac vent or air door is not open.your ac mode switch is bad or the ac air door actutator is not getting vacuum .check vacuum lines to ac switch.besure disable air bags when working around steering area or dash.
i have the same problem on my 84 grand prix..ther is black wire that heat runs through i broke my cause it was so old an dry rotted an the heat stoped coming out the vents but comes through the dash by the winshield
check the vent housing under dash it is vacuum controled most likley you got a line off or broken not allowing door inside to open worse case scenerio the acuator on it has gone out and needs replaced hope this helps
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