Suburban Heat/AC Intermittently Dead (1995)?

I have a 1995 Suburban. Intermittently the blowers (both front and back) and AC clutch fail completely dead. The lights on the switches for AC, Recirculate, and the rear defogger are dead when this happens. This may last a couple minutes or half an hour.
All of the fuses are good (tested with meter). I checked the AC relay (in the under hood fuse box) and "jumpered" the contacts and this causes the compressor clutch to engage. It is not the blower motor as BOTH blowers stop functioning as well as the AC clutch. The rear defogger is in the same control panel and it will not turn on when the system acts up. Then without warning (no hitting bumps or moving other controls) the system will start working. Shutting off the car and starting again does not help when broken. The battery is new and is fine. The alternator is charging the system. When working the vent temperature blows 42 so refrigerant is charged. Ideas? Schematics?

2008-07-21T19:17:55Z

When I jumpered the relay the system was in "failure" mode. Only the clutch engaged, blowers remained off.

BMAC...
You mention a "switch". Is this a relay type switch that shuts off the controls when the key is turned off? If so, where is this located? If you mean the control panel itself, every contol fails at once on the "main" panel below the radio. The controls for the rear AC are up on the ceiling. They do not function either when the main cluster stops.

Is there a fusible link in this system? Which relay shuts off this system when the key is turned off (i.e. where is it located)?

bmac2008-07-21T19:08:54Z

Favorite Answer

sounds like the switch is bad....which is the cluster(ac control panel). the key is the blowers shut, the ac shuts and certain lights fail. the one thing these systems have in common is they are turn on and off with the same switch. no...not the relay switch....the control panel is what I'm talking about. the prob you have is a bad control panel. whats the chances of your ac having a problem, and your blower motor, and the lights? about winning the lotto. the common ground is that they are controlled by the panel. it has an electrical issue because it is intermittant. it acts up when it wants to and effects every system controlled by the panel. by the way....the ac relay is only going to engage the compressor clutch.

01

Rockhead2008-07-21T19:06:38Z

try replacing the AC relay it could be faulty. Since you were able to turn it on while it was jumped

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