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View Full Version : A/C low pressure PSI ???



Decipha
06-03-2006, 07:58 PM
Anybody know how much PSI the low pressure valve is suppose to show at normal operating temperature? I'm charging my friends 97 3800 sfi grand prix and i have no clue what the pressure is suppose to be at, right now i have it at 45 PSI and its blowing cold but i think it's suppose to be a little colder... any help is greatly appreciated

Decipha
06-03-2006, 10:39 PM
come on somebody knows i know some one in here has recharged an a/c before

Decipha
06-03-2006, 11:23 PM
no luck huh? guess im alone on this one

MrSector9
06-03-2006, 11:25 PM
low side is somethign like 30-40 psi, hih side is 300 i think

Alpine CDA-9815
06-04-2006, 12:39 PM
You should be fine, that is right around where it should be IMO.

Silver
06-04-2006, 05:11 PM
Anybody know how much PSI the low pressure valve is suppose to show at normal operating temperature? I'm charging my friends 97 3800 sfi grand prix and i have no clue what the pressure is suppose to be at, right now i have it at 45 PSI and its blowing cold but i think it's suppose to be a little colder... any help is greatly appreciated


thats because its hot out.

PSI doesn't matter to how cold the air gets, that just compression.

Your fine. BTW, let someone who knows wtf they are doing mess with the A/C. One screw up = tragic.

Decipha
06-04-2006, 05:44 PM
thanks just wanted to make sure

Russ Raymer
06-05-2006, 01:21 AM
For r12 pressure should be around 24 psi and for r134a it should be around 27psi. 45 is getting a little high. I am certified in A/C.

94bronco58
06-05-2006, 02:56 AM
Anybody know how much PSI the low pressure valve is suppose to show at normal operating temperature? I'm charging my friends 97 3800 sfi grand prix and i have no clue what the pressure is suppose to be at, right now i have it at 45 PSI and its blowing cold but i think it's suppose to be a little colder... any help is greatly appreciated

Then don't attempt it, one fvck up in the ac system and its some costly repairs, IMO... don't touch it

Russ Raymer
06-05-2006, 06:57 PM
One thing you could try is I know on some vehicles there is a screw on the low pressure cut-out switch. By turning that you can change how low the pressure will go. Maybe check that.