[Wapiti96]

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?!!

 

[Whitecaddy95]

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.

 

[rodnok01]

If pressure really is too high it should set a code off. Need a set of guages to diagnose the system.

 

[basscatt]

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?!!

=====================
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 -

 

[Wapiti96]

Alright, thank you! I’ll try a good set of gauges!

 

[dogbiscuit]

you will need to clear the coes for the CC system before the compressor will work

 

[basscatt]

Alright, thank you! I’ll try a good set of gauges!

========================
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 -

Amazon.com: Aupoko R134A Self-Sealing Can Tap with R134A Tank Adapter, 1/2’’ Acme to 1/4’’ SAE Refrigerant Can Bottle Tap Opener with 1/4’’ SAE Female and 1/2’’ Acme Male Adapter : Automotive

Buy Aupoko R134A Self-Sealing Can Tap with R134A Tank Adapter, 1/2’’ Acme to 1/4’’ SAE Refrigerant Can Bottle Tap Opener with 1/4’’ SAE Female and 1/2’’ Acme Male Adapter: Air Conditioning Line Repair Tools - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

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 -

-----------------------

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