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We charged the A/C system in our Deville, and everything worked fine for a couple of days. Then it quit blowing cold air, the pressure was way high in the system and the compressor is not turning on. Any ideas?!!
 

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95 Caddy DeVille 128k miles
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On my 95 DeVille I had the same problem. The computer shut the compressor down "low refrigerant".
Cleared the trouble code by disconnecting the battery for 30 seconds, then the compressor would kick in and I was able to add refrigerant. If you have an A/C trouble code, it has to be cleared before compressor will engage.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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21,995 Posts
We charged the A/C system in our Deville, and everything worked fine for a couple of days. Then it quit blowing cold air, the pressure was way high in the system and the compressor is not turning on. Any ideas?!!
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let me guess -
you are using a mickeymouse "gauge-on-a-can" with the three colors - green - yellow - red - and NOT a real AC gauge set - correct?

that single "gauge" is only connected to the LOW side pressure -

when the compressor is running
the LOW side pressure gauge shows the LOW side pressure reading -
which is typically in the 35 to 45 psi range -
and the HIGH side gauge shows the HIGH side pressure reading -
which is typically in the 250 to 400 psi range -

when the compressor is NOT running
the entire refrigerant system equalizes out -
and BOTH the LOW side gauge and HIGH side gauges
will display the SAME - STATIC pressure - typically around 115 psi -

SO - what this means is that your system is NOT over-pressured -
it is just showing the STATIC pressure of your system -

the fact is that your system is probably LOW on refrigerant
which is why the compressor won't engage -
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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21,995 Posts
Alright, thank you! I’ll try a good set of gauges!
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if you want to buy a set -
I recommend the MOUNTAIN 8205 - $36 - with free shipping -
https://www.amazon.com/Mountain-8205-R-134a-Manifold-Couplers/dp/B000JFHNG0 -
it includes all the hoses and fittings to connect to a 134a system -

you'll also need a special can tap to dispense refrigerant from the small cans - $10 -

OR -
call your local autozone and ask if they have an AC gauge set in their "Loan-A-Tool" program -
you actually "buy" the tool - and you have 90 days to return it for a full refund -

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let us know when you get the gauge set and we can walk you through using them -
 
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