Question about 1997 Cadillac DeVille

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Ac problems car reads low refrigerant,Ac compressor is off, fill with Freon, but still reads low refrigerant, if I jump ac compressor with hot wire , ac blows cold ???

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  • Cadillac Master
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Either connection is bad to low pressure sensor or pressure sensor is faulty.

Posted on Jun 23, 2014

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  • 1 Answer

Most likely, the pressure valve needs to be changed

Posted on Sep 03, 2014

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Posted on Jan 02, 2017

Carlos Rojas

  • 119 Answers

SOURCE: Problem with AC, dual climate zones

The temperature blend door on the driver's side might be broken or stuck. Also, if this vehicle does not have the correct amount of refrigerant, it will do what you are describing.

Posted on May 22, 2008

Tony Rodriguez

  • 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

michael wiggins

  • 135 Answers

SOURCE: 1997 Deville ac compressor locked out - low

70 psi static does need a charge.find compressor relay, jump relay and compressor will start. add refrigerant,replace relay and a/c should work fine

Posted on May 19, 2009

csmock132

Clint Smock

  • 4669 Answers

SOURCE: 95 caddy AC switch wont engage??

If you have a low freon warning you will need to unhook the battery to reset the system before the compressor will run.

Posted on Jun 07, 2009

Anonymous

  • 1 Answer

SOURCE: 99 STS AC is blowing hot air

I had the same problem but it was blowing hot air on the passenger side of the car. I assume you have the dual zone controls that I have as well. The problem is most likely the damper that controls the flow of hot and cold air into the car. The motorized component of the damper is most likely not working and its stuck in the hot air position.

I had mine replaced by a repair shop so I cant tell you how to replace it but it may be something that you can do if you have the time and patience to work on it.

Good luck

Posted on Jun 09, 2009

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1 Answer

My ac compressor on my 2004 f150 has freon but compressor not getting power to turn ac on . Is this a fuse problem or ?


The system has to make the low pressure limit switch before it energizes the system. If you have 12v at the low pressure switch and verify that there is enough refrigerant in the system to make the switch, try jumping out the switch. If the compressor energizes the coil you are looking at a bad switch. If the compressor clutch does not energize I would look to the AC relay or maybe a bad switch at the control head.

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There are 2 pressure switches on it. High and low. Make sure you jumped the high switch. If so, the ECM could be bad. Check wiring first. Low refrigerant could be the problem also.

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Grab some refrigerant gauges and take readings. If the low side has more than 40 psi or so of pressure, the low limit switch will close and allow the compressor to run. If there is indeed low pressure causing the compressor not to run, you will need to flush the system after eliminating the source of the leak. If the a/c compressor has never been changed, it is probably the source of the leak.

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Low or no freon. Bad compressor. If its low, find the leak, repair, evacuate and recharge with oil and freon. CLEAN Freon. NOT a quick fill with sealant. That will do damage the system.

You can jump the compressor without having the key on. Run a jumper wire from the positive post of the battery to the single wire plug for the clutch. If it clicks, find an AC shop and have it checked for leaks and repair.

Aug 11, 2012 | Cars & Trucks

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My 99 s10 blazer has ac problems. i tried to fill the refrigerant and the psi bounces between 55 and 20, it starts at 20 the builds to 55, then the clutch kicks on and the psi drops back dowm to 20. this...


I'm assuming that's the high side pressure reading. It sounds like you don't have enough refrigerant in there still. Depending on outside temperature the high should be around 130-150 and the low side between 25 - 30 or so with the compressor clutch engaged. Once you connect the can to the low side you'll have to start the car and turn the a/c on to get more in there until the pressure readings are correct.

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1 Answer

My ac wont get cool.......it blows hot air and(caddy seville 95)


Below is a guide to troubleshoot and check system function. This can be done by most folks.

Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.

The system should be filled until suction pressure is about 30 to 38 psi..

Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer2_bing.gif back to the compressor suction.

May 29, 2010 | 1995 Cadillac Seville

2 Answers

On my 2003 Chevy Silverado, the A/C compressor won't kick on. Just blows out warm/hot air.


The ac system may need freon added,if the system is low,or out of freon,it will not allow the ac compressor to come on.

Apr 11, 2010 | 2003 Chevrolet Silverado 2500HD

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The car has been sitting for almost a year. I started it today to drive out of necessity. The A/C clutch does not engage. How do i jumper across the pressure switch to add freon? Thanks, Ken


dont!!! an you start to add freon, itll start to cycle the compresor clutch until within safe operating pressure and then it will hold clutch in constant. charge liquid(with can upside down). if wont take freon in this manner than your more than low on charge. running low on charge will quickly destroy pump, especiallt those old harrisons. the refrigerant also cools the compressor. good luck and wear gloves-

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1 Answer

I have a 1998 GMC Jimmy & there's no power going to my low pressure switch which is located on the accumulator. I ran a hot wire from the battery to the ac compressor, filled the system with 1.8lbs of...


Running a hot wire bypasses any compressor cycling. Low side should pull down to 20 psi or less when compressor is hot wired. If not pulling down you may have weak compressor or way to much freon in system.

Jul 14, 2009 | 1998 Chevrolet Cavalier

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