Question about 1995 Cadillac DeVille

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95 deville 4.9 ac wont come on

Ac wont come on. full of refridgerant but does nothing

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Posted on Jan 02, 2017

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Molson02536
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SOURCE: 95 Deville - Low Refridgerant/AC Comp. off

To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.
Keep in mind that using an A/C gauge set and seeing BOTH high and low side readings can help in diagnosing the problem when you know what to look for. First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.

Normal readings on high and low side with AC OFF (static pressure) - Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s - Ranges from 25-35 PSI - Note that on many Chrysler products a normal reading on the low side may be 15-25 PSI
Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better!  Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged.
If both low and high side readings are too high, this indicates an overcharged system - too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser.

Good luck and hope this helps, keep me posted be glad to answer any question you may have. And yes the A/C system on your car uses R143a and there is a A/C pressure switch along the low pressure line or on the accumulator, it looks like a oil pressure sensor with a two wire lead cliped on it. 

Posted on Jul 02, 2009

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Jan 10, 2016 | 1993 Cadillac DeVille

1 Answer

Can u eliminate ac compressor on 95 sedan deville 4.9


If you can find a by- pass kit,but why

The car is far from new & I wouldn't spend money
doing that, if the clutch turns,nothing saved or gained
doing so.

Try the internet or auto parts store for a kit,I doubt you
will find one for a caddy

Nov 23, 2012 | 1995 Cadillac DeVille

1 Answer

My air conditioner doesn't work, but my heat and defrost work just fine. How can I fix that?


you could ha e a leak in your ac system. listen while your car is running with the ac turned to full blast and see if you hear the compressor cycling on and off. if you dont, hook up a set of ac pressure gauges and see if there is any pressure on the system. if nothing else try adding a can of refridgerant into the system. if unsure how to do so take it to an auto parts store and they can show you where you need to add the refridgerant and probably do it for you.

Apr 04, 2011 | 1993 Honda Civic 4 Door

1 Answer

AC COMPRESSOR DOES NOT INGAGE BLOWER WORKS/ALL SPEEDS AC COOLANT FULL NO LEAKS


Check the compressors coil for continuity. If nothing reads on the volt meter replace the compressor

Apr 21, 2010 | 2001 Cadillac DeVille

1 Answer

Acwon't come on


Take to AIR CON shop as the clutch in aircon unit is not engauging.

Sep 23, 2009 | 1995 Cadillac DeVille

1 Answer

AC BLOWER MOTOR GETS HOT THEN TURN OFF.


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Jul 04, 2009 | 1999 Cadillac DeVille

1 Answer

95 Deville - Low Refridgerant/AC Comp. off


To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.
Keep in mind that using an A/C gauge set and seeing BOTH high and low side readings can help in diagnosing the problem when you know what to look for. First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.

Normal readings on high and low side with AC OFF (static pressure) - Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s - Ranges from 25-35 PSI - Note that on many Chrysler products a normal reading on the low side may be 15-25 PSI
Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better!  Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged.
If both low and high side readings are too high, this indicates an overcharged system - too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser.

Good luck and hope this helps, keep me posted be glad to answer any question you may have. And yes the A/C system on your car uses R143a and there is a A/C pressure switch along the low pressure line or on the accumulator, it looks like a oil pressure sensor with a two wire lead cliped on it. 

Jul 02, 2009 | 1995 Cadillac DeVille

1 Answer

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.

Jun 07, 2009 | 1995 Cadillac DeVille

1 Answer

95 sedan deville wont start and says fuel low with gas in tank


I'd start by tracing the fuel supply and return lines from the gas tank to the engine compartment. Make sure that they are free of kinks or other damage.

Next, check the fuse box and make sure there is power to the fuel pump. Trace the electrical connections leaving the fuel tank and make sure they weren't torn or otherwise damaged by the tire tread.

Hope this helps and good luck!

Jan 13, 2009 | 1995 Cadillac DeVille

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