DC3
Well-known member
I have an '05 Suburban w/ 5.3L V8. Made a trip to another town the other day (120 miles one way). On the return leg, I noticed my AC wasn't blowing quite as cold as it should. I checked the pressure and sure enough it was low. Charged the system but it still wouldn't cool properly. While scratching my head, I get a "Charging System Failure" message on the dash panel. Checked the alternator and no output. Checked the battery and voltage was down to 12.1 V. Battery is a very recent Sears Platinum AGM battery and is not the problem.
Charged the battery manually, then took the Suburban to the shop as I was out of time to work on it myself. They found absolutely no problems. My charge of the AC system was fine. Alternator tested fine. No error codes set in the ECM.
Anyone have any ideas? Could the alternator having no output and battery voltage dropping to 12.1 have impacted the AC system to where it wouldn't cool properly?
Scratching my head over this one but then so are two mechanics.
DC
Charged the battery manually, then took the Suburban to the shop as I was out of time to work on it myself. They found absolutely no problems. My charge of the AC system was fine. Alternator tested fine. No error codes set in the ECM.
Anyone have any ideas? Could the alternator having no output and battery voltage dropping to 12.1 have impacted the AC system to where it wouldn't cool properly?
Scratching my head over this one but then so are two mechanics.
DC