Question about 2000 Pontiac Grand Prix

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NO POWER TO AC COMPRSSOR. CLUTCH NOT TURNING.

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Your charge is probibly low or you pressure switch may be bad

Posted on Sep 07, 2009

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If power is not found at the a/c clutch, the relay is faulty. If power is found, suspect a bad ground, or a defective compressor. the relay in your car controls the ac compressor, but check main a/c fuse first, to see if that is ok! is power going from switch to relay. if so the relay is bad. thats why it will not go to compressor. Good-day! But you can go to this site for more info--.ehow.com/how_5730046_tell-bad-ac-relay

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If the compressor locks up or the bearing goes bad in the clutch, it will ruin the belt. All the accessories attached to the belt will not work, like your alternator, power steering pump, and most importantly your water pump.

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Hi:
The compressor clutch wire goes to the pressure switch , which is often located on the side of the evaporator, or in the line going to the evaporator. When there is enough system pressure, the switch has continuity, and if the system is low or empty, the switch is open, to prevent the compressor from running . If your system is fully charged, you can probably guess the switch is bad, but most likely your AC system is low on refridgerant, and keeping the compressor from running.
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Your compressor clutch is not engaged that was why AC is not on. The clutch is controlled by several sensors: coolant temp, refrigerant pressure, compressor speed sensor, evaporator temp sensor... First to make sure your Clutch is working then start tracing back to these other sensors. Look at the compressor, there is a plug of electrical wire on it. One prong is for speed sensor feedback, the others are for power connectors to turn on the clutch. Jump wires to power to clutch to check if it is working. That is just the beginning of AC troubleshooting. Good luck.

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Have you evacuated the system and charged it with Freon? There has to be some pressure in the system to activate the low pressure switch and allow power to compressor clutch.

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hello. find your receiver bottle, it is black or silver with 2 lines going into it (usually on side of engine toward rear, it will also have a switch into the side of the bottle with two wire, disconect the electrical connector from switch, then put a paper clip between both female connectors. turn on the vehicle and AC, if the compressor turns on and off each time you do this it is working. it is possable for the clutch to work and not the compressor, be sure to put the system under a vacuum before injecting R134....and most important use the correct amount of specified oil. good luck, marty

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