Automotive Air Conditioning Information Forum (Archives)

joe_mn on Tue June 19, 2012 5:30 PM

Year: 1996
Make: cadillac
Model: seville
Engine Size: 4.6
Refrigerant Type: 134a
Ambient Temp: 90f
Pressure Low: 80

i put a vac on system for 1hr. let it sit for 1 hr. gauge does not move. added 12oz of 134a and evap inlet is cold but outlet is hot. vents blow warm air. radiator fans are running. the compressor is cycling about 50% on/off. should evap outlet be cool at least? i know it takes 2lbs of 134a but i was expecting some cooling at evap.

GM Tech on Tue June 19, 2012 6:39 PM

Put in the full charge and then talk to us.....

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

joe_mn on Tue June 19, 2012 8:57 PM

good advice. i had to run an errand. the a/c was working with 12oz but barely. than 10 min in, the a/c shutoff. i can check codes in the caddy and it said ac1347, low freon. i got home and let car cool off. than just now i cleared code and added another 12 oz. my low side pressure is 40psi. the evap outlet is cold and the vents are blowing cold. i think the current temp is about 88F so the cold vents feel nice.

bueller on Wed June 20, 2012 6:34 PM

Your caddy calls for 32oz, so you're still short of a full charge.

Cussboy on Wed June 20, 2012 10:56 PM

Don't run the AC when the level is low. Low refrigerant = poor oil circulation.

joe_mn on Mon July 23, 2012 6:27 PM

a/c still is functioning after 1 month. just thought i would update my cars performance. i know folks come back here constantly to ask for help and most of the time they never seem to be heard from again.