Question about 1997 Mercury Sable

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The AC (put in a new compressor) only works on high (no matter where the switch is) and sometimes you hit a bump and it will then be on low for a moment. I'm thinking it's the switch.

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The switch or faulty wireing

Posted on Oct 08, 2010

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Have a 1988 Lincoln Town Car, have put in new A/C compressor,new drier, new condenser, new hoses, new evaporator & full of freon. But compressor want cycle, what could be my problem???


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Where is the low Freon switch on 96 Seville sls


Follow the wiring going to the clutch and you will bump into the relay and/or the freon switch, which will be mounted on the AC plumbing since it is monitoring the pressure within the tubing. When the pressure is low due to low refrigerant the switch will open and shut off power to the clutch and that stops the compressor from turning.

Jul 04, 2015 | Cars & Trucks

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I was told by A/C guy I have a short somewhere to the high pressure switch. something is not kicking on the compressor. another mechanic said I need a new computer. what do you think


go with the ac guy
there are systems that prevent the ac compressor working
high pressure switch which cuts the ac clutch if the head pressure goes too high
low pressure switch which cuts power to the ac compressor if there
is no gas in the system
climate control systems which cut power when the ac is not required
fuses to the ac system
get a better explanation or seek advice from other ac mechanics

May 01, 2015 | Cars & Trucks

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My Cadillac 08 CTS will not blow cold air the relay checked out but when I jumped the relay the compressor kicked in and it blew cold air when I put the relay back in I had nothing tried a horn relay...


there are 3 switches that control the operation of the ac compressor . There is a high pressure switch that will not allow operation if the head pressure goes too high ( excessive gas-blocked system-tx valve condenser fan not working )There is a low pressure switch that stops the compressor when the gas has leaked out and is insufficient A thermostat that will not register and so will not switch on the compressor and finally ac compressors will not work unless both the ac switch and the blower are switched on. Have the system checked out by an accredited ac specialists.;l

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Fast Idel Switch


No.
When the computer senses the compressor is adding a load to the engine it bumps the idle up with the IAC valve.
There may be a low or high pressure switch on the compressor which cuts power to the clutch if the freon pressure is too high or too low.

Sep 05, 2012 | Cars & Trucks

1 Answer

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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1 Answer

1996 cadillac deville compressor stopped, new compressor and dryer put on, but unit will not accept freon. Please help.


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New ac compressor put on worked great now the ac compressor will not come on. it is full of freon


did you oil the compressor? you have to put a predetermined amount of oil in the compressor before running it.

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AC Wont charge after replacing components


whenever the ac system has been opened it should be hooked up to a vacuum pump designed to evacuate the ac system of any foreign debris and oil etc and after should be able to hold a vacuum to show that there are in fact no leaks then if all is ok at this point you can then charge your ac with the proper freon specified for you car when the pressure reaches satisfactory level the ac compressor will then cycle on you should not bypass the low pressure switch

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