
Bad A/C compressor making engine stall?
2002 Chevrolet Trailblazer LTZ - Inline 6 Cylinder.
Little over 100K miles.
My father's car.
His battery died and was replaced, which birthed two issues.
First his duel climate control zones broke, driver was cold, shotgun was hot.
I fixed this by resetting some fuses.
MAIN ISSUE: Turning on AC at idle causes the engine to drop RPM and die.
When revved up to about 1,000RPM or so, and then the AC is engaged, the system works stable. Engine stall only happens at low RPM (idle).
I can see the AC compressor turn on, spin a few times, and then turn off, the RPMs drop and usually the engine cannot recover.
Thought maybe the throttle body was the issue, not enough air into the engine to compensate for the extra load at idle. I took the airbox off and cleaned the throttle body, at the same time I unhooked the battery and waited, reattaching it so the regulator can re-learn idle.
No luck. Still dies. This is either a bad AC compressor, or a bad throttle body. I'm out of troubleshooting steps so that's why I'm here. Any help?