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the compressor protected by a pressure switch it only turn on the compressor if there is a pressure on the system if no pressure it means there a leak on the system try to check
possible you have a bad low or high pressure switch on a/c system bad causing compressor not to engage, find switchs and jump across wires and see if compressor engages
If by heat you mean defrost, it could be a seized AC compressor or compressor clutch, since the AC compressor is also engaged when in defrost mode to remove moisture from the air.
Try turning the flat, round plate on the front of the AC compressor by hand (WITH THE ENGINE OFF!!) If turns with only a little resistance, the compressor is most likely NOT your problem. If it not turnable by hand, then your compressor is seized up will most likely need replaced.
Under the hood in the relay panel will be a relay for the compressor. When you locate the relay box look on the underside of the lid for the legend (layout) of the relays. Pulling that relay will stop the compressor from turning on.
You can also just unhook the connector on the compressor and secure it to stop the compressor from turning on.
If you need the compressor clutch to not turn at all, like if the bearings are bad, then you need to buy a smaller belt to bypass the compressor all together.
Hot wire the compressor from battery and see if it turns on. If it does then there is fault in AC switch/relay/wires. If the compressor still not running then compressor coil is gone, fortunately it can be replaced easily and you need not change the whole compressor.
When replacing the compressor the dryer should also be replaced, you put 2oz of oil in compressor and stand compressor on pulley for 5 min, then after install turn clutch 10 turns to pump most oil out of compressor, the dryer should have 2 oz of oil also, if you are flushing the ac system out with a solvent then more oil is needed for the system, if your just replacing the compressor then 2oz in compressor.
Possible Low on Freon, Bad Compressor Clutchhead, Blown hose, which in turn let all the freon out. Manually power up the single wire going to the compressor with the car running and see if the compressor clutch head turns on. If so Odds are the compressor is good. Check all hoses and compressor for buildup of oil which would be assumed as a leak.
have the a/c compressor checked, the a/c compressor might be locking up due to wear and bad bearings. one way to test is to try turning the compressor clutch while the ENGINE IS OFF, if the clutch is very hard to turn or won't turn at all by hand then the compressor is bad. the clutch is what turns the pully, the pully should spin freely, the compressor clutch is on the end of the compressor on the pully side.
THE A.C COMPRESSOR BELT ALSO RUNS THE ALTERNATOR.AS OF YET THERE IS NO PULLEY U CAN INSTALL TO BYPASS THE A.C COMPRESSOR.SO YES YOUR A/C COMPRESSOR MUST TURN IN ORDER FOR THE ALTERNATOR BELT TO TURN.CALL AND A COUPLE OF ESTIMATES
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