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Ac relay switch - 2006 Volvo S40

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97 chevy suburban AC clutch won't engage pressures


Looks like the low pressure switch gets power from a 10amp ac fuse. Power then goes to the ac relay which is powered on by the ac heat controller on the dash. Power then goes thru the high pressure switch to the compressor. The ac relay is grounded to the body. Do you have power on the lite and dark green wires going into the relay and is it grounded ?

Jul 26, 2013 | Cars & Trucks

1 Answer

No power to AC clutch 1994 olds cutlass ciera 3.1 litre


Have you tired jumping the AC compressor low pressure switch?

May 25, 2012 | 1994 Oldsmobile Cutlass Ciera

1 Answer

Ac relay not energizing on 2005 ford freestar


The very 1st thing you do is see if the AC system has lost its charge of refrigerant. If the system is low on charge then the relay will not engage because it receives no signal from Compressor cycling switch which in most Fords is located in the low side AC line from the compressor, the low pressure line is the larger of the 2 lines from the AC compressor..

Mar 23, 2012 | Ford Freestar Cars & Trucks

1 Answer

What energizes ac relay on 2005 freestar


The low side pressure switch in the AC low pressure line signals the PCM (computer control) to close the AC compressor relay and raise the idle speed. If the system is low on refrigerant charge the relay will not allow the system to engage the compressor, this is because the oil that lubricates all the works is suspended in the AC refrigerant, if that is low then the system gets no lubrication and will quickly seize up..

Mar 23, 2012 | 2005 Ford Freestar

1 Answer

Problem is that the AC CUT OFF relay energised permanently. therefore electric clutch of compressor swicthed off permanatly, because current to compressor clutch goes through NC (Normally Closed) contact...


check for the cut off switch or sensor on the a/c plumbing to see if normally closed or normally open, and if it is causing the the AC Cut of relay to be energized permanently.

See if disconnecting the switch on the plumbinug changes anything. Or if using a test light to ground out the terminals does anything different on the AC system.

Feb 03, 2011 | Ford Econoline Cars & Trucks

1 Answer

My jag's a/c compresor froz up and now shop wast 1200.00 for change out and charge system. Is that all it will need jag X type 3.0


The AC is driven by a pulley pulled by the serpentine belt. When the AC is switched on an electrical clutch engages the driven pulley with the AC compressor on the same shaft. If the AC compressor is frozen up the pulley will not turn when the AC is switched on and the belt will squeal as it is pulled over the static pulley wheel. If, when the AC is switched on, the pulley wheel continues to spin then it is likely that the electrical clutch is not engaging. It is much more often the case that the clutch fails before the AC seizes. If this is the case check out the AC fuse and clutch relay. The fuse can be inspected visually and the relay can possibly be inter- changed with one that is similar (windscreen wiper or electric windows). The relay should make a 'click' that can be heard when the AC is switched on. Put the suspect relay into a circuit that you know is working in order to check it.

Jul 01, 2010 | 2004 Jaguar X-Type

1 Answer

Where are all the ac switches and relays located


Check the low pressure switch,it is on the dryer or on the low side line,the large ac line,this can be the problem,try jumping the two wires that are plugged into the switch.If the freon is low,or out,this switch will not allow the ac compressor to come on.

Jun 21, 2010 | 1997 Chevrolet S-10 Pickup

2 Answers

AC/heating fans don't work


The relay center is under the hood, there should be several with the same #'s switch one that you know is working in place of the fan relay, if fans turn on replace relay. It is faster to turn on ac after switching relays for diagnostics as fan should run as long as ac is on...

Dec 10, 2009 | 2004 Honda Accord

1 Answer

Can some post the 1999 gmc sierra wiring diagram


you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.

Jun 28, 2009 | 1999 GMC Sierra

2 Answers

Ac compressor


take it to the deeler

Aug 07, 2008 | 1995 Honda Accord

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