Last summer my air was working. this summer it is not. Buit the problem seems to be that there is some type of short when I go to turn my fan on. I can't here it when I turn it all the way on high. Nor does the cluth in the compressor kick on. But if I pull the relay (1172 in a '92) and jump it then it kicks on. So I put a new relay in but still no go. In the spring time sometimes it would kick on if I hit a bump. In the fall I installed a new heater core. could I of hit a ground somewhere or is my blower motor gone or a short somewhere?

 

Shorts blows fuses, and you testet the hi-speed hi-current circuit yourself so that and the fan is not the problem.
Your problem is called poor/ bad/ loose contact, since it kicks in at bumps. It may be caused by oxidation etc. Look at the contact behind the A/C control head panel.
Does the fan work at all btw., in any setting (exept for jumping relay)? If not then there's a HTR-A/C fuse to check out.
All contact areas should be bright & shiny for reliable operation.

 

The fan kicked on yesterday for a moment. It is not a fuse. I think it is some kind of ground or short. The fan does work.

 

ttt...someone tell me where all the grounds are in relation to the cooling fan

 

Still having this problem and wondering if anyone can give me some leads on where to start. I have a few days off to get under the hood and it looks like hot weathers coming.