Automotive Air Conditioning Information Forum (Archives)

pwbum1 on Sun March 09, 2014 6:53 PM

Year: 2003
Make: chevy
Model: suburban z71
Engine Size: 5.3l
Refrigerant Type: r134
Ambient Temp: 70
Pressure Low: 45
Pressure High: 50
Country of Origin: United States

Good evening all, recently my a/c stopped blowing cold air. The compressor came on intermediately then stopped all of a sudden while troubleshooting. The jumper wire engages the clutch on the compressor...cant really tell if the compressor is on (any help would be grateful). Even while compressor is running A/C still blows cold air, at idle low side read did read 30 psi so i added some refrigerant to get 45 and the high side reads 40 before and after adding refrigerant. When the compressor kicks on the low psi goes to 65 and the high goes to 50-53 psi. Any thoughts on what would cause such a low high side pressure? The office tube is clean, no clogging or debris.

TRB on Sun March 09, 2014 7:22 PM

For starters I would check for leaks and get a proper charge on the vehicle. If you still have a low high side I would check that the compressor is working correctly.

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mk378 on Mon March 10, 2014 9:29 AM

Pressures that low mean that the system is basically empty, so it can be concluded that there was a substantial leak.

Don't jump the compressor and run it dry. Like TRB said, you need to be sure there's a full charge first then evaluate performance. Some GMs have a lockout feature in the computer which is intended to avoid compressor damage in case of a leak out. If the compressor still doesn't start with the system full, the computer may need to be reset.