Question about 1995 Pontiac Sunfire

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Ac compressor not working try it irectly to battery and its fine. but when i put it back together its not working

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Find ac preasure switch and install jumper,if compressor comes on it will be either low on refrigerant or faulty preasure switch.

Posted on Jun 17, 2009

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IDLE problems when I turn on the AC. Electrical power seems to fluctuates when the car is stop sign/light or other when i have the AC on. Check it the other day, started it up, disconnected the battery,...


alternator needs good battery to keep SCR in the regulator on if it is loaded it will shut down. this will happen when you try rolling window down or rear defog will load up the system. When the truck is running and battery is hooked up the vehicle should run at @700 RPM at idle and when A/C compressor is commended on it should idle up to @1000 RPM and then back down to @700 RPM when compressor cycle off again. But if the system almost stalls then the battery and alternator should be changed together, A bad battery will damage a new alternator and a bad alternator will damage a new battery.

Oct 07, 2009 | 2006 Chevrolet Trailblazer

1 Answer

The A/C doesnt work although its topped out.


Verify compressor operation. With it idling have the hood open and watch the compressor, and make sure the center of the wheel turns. If it doesn't then you either have a bad wire, fuse, relay, pressure switch, or compressor clutch. Check the fuse first, if its good then locate the pressure switch, most of the time its on the drier near the front behind the grill or near the fire wall at the passenger fender. Pull the connector off and there should be two pins in the connector. Take a jumper wire or even a large paper clip will work and connect them together to see if the compressor kicks on. If it does then you have a bad switch and will need to be taken to a shop that can drain and recover the AC coolant. Take it to a shop that can put the old freon back in it. And try to be in the shop when they do the work so that they can't charge you for new freon if they put the old back in. My AC doesn't work due to a bad pressure switch. And make sure you don't run it with the pressure switch bypassed, otherwise the system will blow up.

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try removing the plug off the low pressure switch on the accumalator plug a paper clip into the plug and turn ac on if it comes on then your low pressure switch is bad or your low on refigerant.

May 28, 2009 | 2000 Chevrolet S-10

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FYI - The reason for the AC kicking in is to remove humidity from inside vehicle, which allows for faster defrost, and less build up of moisture on windows etc. This is common on all vehicles with AC. Only remedy would be to pull wire connector off compressor. Remember though, It will take longer to defrost, and try to remember to hook it back up once in a while to keep your compressor working, so it doesn't seize up from not being used.

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