Question about 1991 Cadillac DeVille
#1) 1st Check to make sure your compressor is engaging (CYCLING) then possible theres a Leak in Your System/Or a Clogged up Expansion Valve,Very Common.Which is Located going to the Lines from the Firewall to your Evaporater.
#2) You'll need to Completly Discharge your Freon from your A/C System.Which should be Discharged in a Recovery Can.and not in the Air.
#3) And after the System needs to be Completly Evacuated ,which takes a A/C Suction Pump.If your Doing this yourself I'm not Sure if you Can Rent this Pump or Not.
#4) Since your A/C system is Now Empty after the Evacuation:I would have your A/C Flushed Out Completly.
#5) Lots of times it somehow gets some Foreign Material in it that Prevents the System From Working Correctly.
#6) Now start your Engine Turn your A/C on Maxx Cool and Run the Fan on High as well You'll need to add the Oil(PAG) that was lost during the Evaperation as well. If your doing you'll want to msake sure you buy R-34 With a Gauge.This Way the Gauge will indicate when its Full (In the Green area on Gauge)
#7) Now if ALL the Above has been Complted you Should have Cold Air in your Vehicle.Providind All other Components are working Right.
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Posted on Jul 13, 2010
Posted on Aug 24, 2010
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Posted on Jan 02, 2017
Hello I'm a M.B. tech. 1st you need to know why the freon is low. Hopefully it just needs to be serviced. There is a component located in the lf of the engine compartment called a receiver drier. It soaks up the moisture in the freon so the gases can work the way they are supposed to. On this unit there should be 2 switches(I believe they were combined into one switch in 98. 1 switch is a temp switch that operates your electric fans, the other is a compressor cutoff switch. Assuming the compressor is not coming on-take a fused wire and bridge the 2 contacts- If the compressor does not come on at all there is another problem(it is not low on freon. On the condenser there is a high side port(it is the bigger of the 2)By the brake master Cyl.(lf of the engine compartment thereshould be a smaller low side valve in line with the fuel cooler hose. Usually you can hook up a machine to the low port and **** freon in through that port. Assuming you do not have a refrigerant machine. It is very self explanatory on the bottle of r 134a refrigerant which can be purchased at your local auto supply store. I would start with 1 lbs. and add dye with the freon in case there is a big leak. If the system is overcharged it will not cool properly. I believe the system capacity is approx. 2 lbs. Add a few ounces after the first pound until a/c system is cooling properly and the electric fans are also coming on when the system gets to high. If you get a can with a good Gage set on it you should see the high side between 150 and 2000 psi(fan coming on at max. press.) also the low side should read about 35. It is about the temp of the evaporator which is i=located in the dash and the blower blows through this component out through the vents. Hopefully I have been helpful.
Posted on May 28, 2009
SOURCE: 2003 accord air conditioner
This is a common problem when the AC system has a low charge.
If this is the case, you have a leak somewhere. Do not try to fix it yourself without the proper equipment.
Posted on May 21, 2009
Take it to a garage and have them evacuate the system and refill with refrigerant. you have air and non condensibles in the refrigerant system.
Posted on Jun 02, 2009
all cars of that year use r-134 refrigerant. Follow the ac lines till you run across the service port. The one near the evaporator (front of engine) is the high side; leave that one alone. It usually is marked with a red cap
the low side port is near the firewall, and usualy has a blue cap. The valve for a refill can usuallly will only fit on a low side. When filling the can will get very cold very fast. If the can doesnt start to get cold immediately, remove it you have it on the wrong side. Make sure to remove it immediately, as keeping it on the high side will pump liquid freon into the can causing it to explode.
Posted on Sep 04, 2009
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