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Originally Posted by John Vinti
I have a 99 Suburban with front and rear ac. It recently has stopped blowing cold air. I added 15 ozs of 134a +, up between 25 -45psi with no improvemnt. I noticed that when the compressor cycles the pressure drops below 25psi.
1. Have I recharged improperly?
2. Could there be another problem?
3. should I add more 134a +
I would appreciate any other suggestions since this was the fitst time ever I tried servicing the AC system on any vehicle. There are no other symptons on this vehicle , just lack of cold air.
Thank You
john
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with the windows open and the fan speed to max...the compressor should continue to run and not shut down or drop in pressure with the air temp @80deg. f...R 134 low side pressure should be at 40 psi...if pressure drops then rises add small amounts until pressure stabilizes....
where the refrigerent lines at fire wall go into the vehicle using your fingers feel for both lines to be at about the same cold temperature..
if these lines are not cold and the pressure is steady at 40psi at low side fill point you most likely have air in the refrigerent system....
don't forget to check the temperature door control as this can cause lack of proper temperature from vents....
if you add too much r134 you could damage compressor so with compressor running the pressure must never get above 50 psi ....