Question about 1994 Cadillac DeVille

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AC compressor clutch not kicking on 94 cadillac deville

Fuse, relay and low side pressure switch new

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

  • 255 Answers

SOURCE: 1998 cadillac deville reads service ac system

Hi,check if the compressor clutch is engaging,if not check the conection at the compressor if ok check,fuse ,or relay ,if those are fine and the commpressor is engaging,check freon presure ,may be too high or low, if this is the case ,correct the problem and disconect the negative cable from the battery for a minute to reprogram the sistem..C1

Posted on Jan 04, 2009

m036_094
  • 107 Answers

SOURCE: 1998 cadillac deville still reads service ac system

Sounds like you have a problem with the pressure switches on the ac system. Find the aluminum lines for the ac, attached to the lines are two pressure switches plugged in to the car wiring harness. Make sure the sensors are tight into the fittings on the lines. If they are unplug them one at a time and bridge the two terminals in the plug going to the car's harness not the switch, with a jumper wire or cotter pin which ever wire turns on the ac compressor remove that switch and take it in to the auto parts store and get another one.

hope this helps you out

Posted on Jan 07, 2009

stormbrewin
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SOURCE: changing the thermostat 2000 cadillac deville

The pressure they work within is usualy information on your radiator cap or owners hand book.Your thermostat should be a 180 degree but can vary The 180 is in reference to the heat required to open them so water can flow through and be kept at a more or less constant 180.There are other temp ranges for a wide variety of applications and 180 is the standard one for most vehiclesThe radiaor and water system is pressurised to lower the boiling point of the water The higher the pressure the lower the boiling point

Posted on Feb 15, 2009

  • 1 Answer

SOURCE: replace my fuel pump relay

The fewl pump relay is located in the bottom part of the fuse box under the hood. It is labeled on the cover where it is. It is one of the big black square s usually taped to the one above it. Cost is about fifteen bucks at advance auto.

Posted on Feb 22, 2009

csmock132
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SOURCE: locked out of the trunk 94 cadillac deville

Is there a trunk release button in the glovebox?

Posted on Mar 26, 2009

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1 Answer

Ac clutch not kicking on


ADD Freon. It's a R134 system and the pressure is too low. Trust me add Freon and it will work fine. With a low amount of Freon if you jump the low pressure switch at the accumulator it will be very cold but will not have enough pressure to kick on the low pressure switch.

Jul 22, 2012 | 1991 GMC K2500

2 Answers

When i turn on the a/c,the compressor does not work


CHECK REFRIGERANT CHARGE. USING A MANIFOLD GAUGE SET. HOOK MANIFOLD GAUGE SET TO LOW PRESSURE PORT AND HIGH PRESSURE SIDE PORT. LOW SIDE PRESSURE SIDE SHOULD HAVE 25 - 36 PSI AND HIGH PRESSURE SIDE SHOULD BE 178 - 237 PSI. IF LOW SIDE PRESSURE SIDE READ BELOW 20 PSI THE LOW PRESSURE SWITCH WILL NOT TURN ON THE AC COMPRESSOR CLUTCH NEED TO ADD LITTLE MORE REFRIGERANT. IF REFRIGERANT LEVEL CORRECT CHECK AC COMPRESSOR FUSE AND RELAY.IF POWER GOING TO AC COMPRESSOR CLUTCH YOUR COMPRESSOR CLUTCH HAS OPEN WINDING. AC COMPRESSOR CLUTCH NEED REPLACING.

Aug 11, 2011 | 1997 Nissan Pathfinder

1 Answer

A C compressor want come on, no fire to the compressor nor low pressure switch


Your A/C compressor clutch is controlled by the Electronic Climate Control Module (ECCM) via the compressor clutch relay. The low pressure switch only completes the circuit between fuse #A3 in the engine compartment fuse block to the high pressure switch, which in turn, completes the circuit to the control (or primary) side of the clutch relay. It does not provide direct power for your clutch. The primary ground side of the relay is controlled By the Powertrain Control Module (PCM).

If there is no power on either terminal of the low pressure switch, it can only be a blown 10 Amp fuse #A3 or a broken wire between the fuse and the low pressure switch. If the fuse is blown, replacing the fuse will not fix your car unless you find out and correct the reason why the fuse blew.

If this is not the problem, the only EFFECTIVE way to diagnose this system is to scan your computer system for fault codes and diagnose it accordingly.

Please also review these articles:
What Else Could Be Wrong?

Where's The Fuse?

Jul 18, 2011 | 1994 Cadillac DeVille

1 Answer

Where is the AC low pressure port located on a 1996 Cadillac DeVille?


either on the low side hose normally it is on the accumulator bottle which also has the clutch cycling switch for the a/c compressor

Jul 08, 2011 | 1996 Cadillac DeVille

2 Answers

Ac problem no voltage to ac clutch on dodge caravan 1999 3.3 eng


If you do not have enough refrigerant in the system. The low pressure switch will prevent the compressor from engaging to avoid damage.

Check your pressure.

I don't recommend this, but you may need to jump your low pressure switch to get the compressor going to add more refrigerant to the system. But if your low on charge, it may be "best to take it to a shop to have them fill the system".

Jun 09, 2011 | Dodge Caravan Cars & Trucks

1 Answer

I have a 1999 Ford Expedition, Eddie Bauer. The ac compressor clutch will not kick in when useing the climate control. The system is fully charege. I ran power directly to the comperssor and the clutch...


Check the high and low pressure switches, either switch can cause the compressor not to run. Look for the switches in the high and low side lines. Hope this helps, let me know.

Sep 22, 2010 | 1999 Ford Expedition

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.

Aug 16, 2009 | 1992 Cadillac DeVille

3 Answers

A/C Compressor not kicking on


The power to run the compressor clutch coil goes from the battery, to the AC Clutch Relay, somewere in the engine compartment fuse box, then it goes to the positive side of the AC compressor clutch coil; goes thru the coil, activating the compressor, and then goes to complete the circuit through another switch (high pressure protection switch) in the back of the AC compressor and finally reaching negative or Ground.

Disconnect the AC compressor clutch connector and using a 12 V bulb with 2 wires (test lamp) check the following:

1.- connect 1 lamp wire to battery neg; with the other check both pins at connector with the AC in the RUN (AC and ignition switch on ) you should have power in one side.

2.- connect 1 lamp wire to battery positive and with the other check both pins at connector, lamp should light getting the ground from the clutch connector thru the high pressure compressor switch to ground.

On the other side what makes the relay close and let the power flow to the clutch works with the low pressure switch, (if the freon pressure is too low it opens and kills the ground to the relay coil and that kills the compressor), that low pressure switch is in the low pressure side of the freon tubing, the fat pipe that comes from inside the firewall into the accumulator/dryer, a big aluminum cylinder sitting on the right side of the engine compartment in GM cars.

To know if the low press switch is the cause you can unplug it and connect both legs with a paper clip for a minute or two, no more, you don't want to damage the compressor. anyway if jumping the switch makes the compressor come alive and kick in, you either have low freon pressure or a bad switch; it's time for the pressure gauges and check how the compressor is pumping and that is better left to a pro.

By the way you said that your system is a R-12 system, have you considered switching to R-134a the new "ozone friendly" freon? to do that you need to evacuate the system with a recycling machine and pull vacuum in your AC, if it holds the vacuum for a while, then you can be sure that there are not leaks and then dump 1.5 or 2 pound (check the labels in the engine compartment) of R-134a into your system. it will be a good idea to put some fluorescent leak detecting dye in the system to check for leaks, just in case..

Jun 13, 2009 | 1992 Oldsmobile 88

1 Answer

AC compressor blows fuses when it goes to kick on.


As a mechanic I NEVER put that JUNK in ANY system, they clog up A/C compressor's and every thing elese. (You might have to replace most of the components in your vehicle now. ie condenser, evaporator, compressor, receiver/dryer (accumulator), orifice tube (thermo expansion valve) and you may be able to flush out the lines.

Apr 27, 2009 | 1994 Cadillac DeVille

1 Answer

Ac low on 99 devill


You have to make a jumper wire to put in the plug of the wiring that hooks on the pressure switch. This will kick on the compressor, and enguage the clutch on the compressor. Then you van charge the system.

Feb 09, 2009 | 1997 Cadillac DeVille

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