Question about 1997 Cadillac DeVille

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A/C compressor shut off message on my caddillac inst. panel

Looking for the low pressure port so I can service my 1997 Cadillac Deville's air conditioner.

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Should be on top with black top on it.

Posted on Jun 28, 2009


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2 Answers

Ac problems

Either connection is bad to low pressure sensor or pressure sensor is faulty.

Jun 22, 2014 | 1997 Cadillac DeVille

1 Answer

1994 Cadillac Deville I need to find the low side ac port. When I hooked up to the one I thought it was the pressure was in the red. Compressor has shut off because of low Refrigerant

The high and low ports are two different sizes.
If you're using the cans you get at the auto parts store, they only fit the low pressure side.
When it was in the red, was the engine and air conditioning running at the time?

Aug 10, 2013 | 1994 Cadillac DeVille

1 Answer

Low freon than low oil pressure than shuts off and restarts going down the road

Replace the oil filter as it is clogged very cheap fix. I hope this helps.

Sep 04, 2012 | 1997 Cadillac DeVille

2 Answers

Where do i add freon to my 1995 cadillac sedan deville ac

Freon is allways added to the low-side service port. The service manual does not een mention where the service ports are on your vehicle. The service manual assumes that this is being done by a trained technician who knows how to find the ports.
For help in finding your service ports, go to There you will find instructional videos and you may also find your vehice in their database with pictures of where your service ports are located

Mar 11, 2012 | 1995 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

1 Answer

Air compressor wont come on to to put in 134a

The AC compressor does not have to be running to charge the AC system, and the low pressure switch will even prevent the AC compressor from operating until there is sufficient pressure to operate the AC compressor without damaging it.

Start the engine and turn on the AC, then charge the system with the R-134a and as soon as there is enough pressure built up to trip the low pressure switch off, the AC compressor clutch should then engage and then finish charging the AC system.

May 31, 2010 | 1997 Cadillac DeVille

1 Answer

A/C compressor off - how to restart it?

it is on the large ac line/hose ,it is the small service port the larger service port is on the small line/hose is the high side dont fool with it to reset ,,, disconnect the negative battery cable for 20 seconds and re connect

Jul 03, 2009 | 1995 Cadillac DeVille

1 Answer

Air Conditioning system 97 deville

Look for a high side pressure sensor. It sounds like something is tripping an A/C code.

Mar 11, 2009 | 1996 Cadillac DeVille

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