Question about 1997 Cadillac DeVille

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I jumpered the low pressure switch ac will not run until i manually ingage the compressor relay

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  • plc_saleseng Jun 23, 2009

    The freon levels are good and i have since reconnected the low pressure switch and still can only get the comp. to run by manually ingaging comp. relay the climate control seems to be operating fine and not showing any codes any other suggestions?

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  • 78 Answers

Check that you have enough freon in the system problem sounds like you dont and wont let it turn on you might burn out the compressor by jumping it,the switch is a safety feature

Posted on Jun 22, 2009

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1 Answer

AC blows warm air. 07 GMC Envoy 6 cyl. 4wd


You probably replace the wrong switch. I believe the high pressure switch is mounted in the back of the compressor. Pull the plug and jump it. If it works, replace the switch. I don't recommend you leave the jumper in the plug. If it the A/C pressure is to high, you could blow lines and such. Costing you a lot of money.

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No current to ac compressor


A mechanic would start at the compressor and work back.
Did you jumper the low pressure switch, or the relay, or put power directly to the ac clutch ?
You have a low pressure switch that should be closed and a high pressure switch that should be closed to put power to the compressor clutch. If the freon pressure drops below 20psi the low switch opens, if it goes above 300 psi the high switch opens.

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You must have a leak, the compressor will not run if the system is low on charge, the charge carries the oil to lube the parts of the system. Also do an electrical jumper of the compressor cycling/pressure sensing switch.

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I have a 2001 Ford Mustang V6, the ac is blowing warm air. We checked the refrigerant and it is full. The ac compressor will kick on for a few seconds and then kick off. Why is the compressor not staying...


it's either low (in spite of your readings) or your a/c clutch is not working correctly or you have too big an air gap in the clutch.
First, just disconnect the 2 pin connector from the a/c pressure cycling swithc and jumper the 2 pins with a wire to force the clutch to stay engaged. See if it blows cold then, and stays engaged. You can run this way for about 15 minutes before you have to pull the plug.
report reulsts.

please don't forget to rate.

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Warning light says Low Refrigerent-AC/Off. I tried to recharge the system but the Compressor won't engage, How do I get the Compressor to come on so as I can recharge the system. Is it a pressure swithch...


in order to recharge the ac you first must clear the trouble code for the ac off warning. when you get this warning the computer shuts down the compressor to keep it from running without the lubricant that is in the freon. clear the trouble code and the compressor will run and you can recharge the ac.

Jan 05, 2011 | 1998 Cadillac DeVille

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A/c has full freon but the compressor clutch wont engage. i have found that the plug going into the compressor is not getting any power. what could be the problem?


On the low pressure line of the ac you have a pressure switch which allows the compressor to come on once a certain pressure is reached, and it will cut the compressor off if the pressure is too high or too low. Look at your ac hose and find the switch *you will see wires connected to it* you may need to replace this switch. You can use a test light to see if you are getting power to the switch. You should check you fuses, and the ac relay witch is usually in a black plastic box under the hood.

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4 Answers

A/C is blowing hot air. Freon is full, compressor


Not sure how you know if the freon is full without the unit running. There are a number of switches which can keep your A/C from coming on. There is a low pressure switch which is usually located on the larger line and sometimes located on a silver cannister (called an accumulator) which is the low side of a compressor circuit. There is also a high pressure cutout which is usually located on the back of the compressor unit. Both of these switches can be jumpered out to see if they are the reason for the compressor not working. You remove the two wire connector to either switch and place a small jumper wire between the two wires on the connector block. The other reason my be a low idle cutout switch and this will also usually be located near on on the compressor. You can also test it the same way as the other switches. If it is the low pressure switch then of course you will need to add freon which you can purchase from any auto parts store. They usually come with instructions and all the equipment needed to add in freon. If it is high pressure, then some of the freon should be recovered from the system by a technician. If is the low idle cutout then you will have to take it to a mechanic to understand why it is idling so low. Hope this helps.

Jul 16, 2010 | 2004 Kia Sedona

1 Answer

Ac compressor will not ingage it has refrigerant in it and low pressure switch is working any ideas


check the ac fuse for continuity and then check the relay that supplies power to the compressor,and then unplug the "magnetic clutch coil" that in front of the compressor and check that coil for continuity.they draw a lot of current and can burn open after time ,and also clean any connections as well, especially ground connections

Apr 06, 2010 | 1991 Ford Aerostar Extended

1 Answer

AC compressor clutch is cutting on and off steadily during compressor operation.Is this clutch or clutch coil?I was pushing buttons on electronic climate control,and suddenly AC stopped working,only have...


You have to start by testing the pressure in the system. If it was cycling a lot and then quit it sounds like you developed a leak somewhere and once it fell below the low pressure switch it will not come on.

The system works with a high and low pressure switch that will cut out if the pressure is too high or low. When the system looses pressure it will fall below the low while running, turning off the compressor, When the compressor is off the high side and low side equalize out bringing the stationary pressure above the low limit, turning the system on again. This cycle will repeat until there is not enough pressure when equalized to turn the system back on.

If the pressure is good, go next to the relay, it should be located on the fire wall. if the relay is right, then you need to determine if it is high or low pressure switch shutting it off. IF it is the high, you probably have a restriction in the system, You could also have a problem with the compressor. With the car not running manually turn the clutch and see how much play, smell the area and smell if there is a burnt odor, then try to turn the armature that goes into the compressor. see if it is frozen.

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2 Answers

No power for AC compressor


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.

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