I have recently tried to fix my a/c system, however, when I pressed the A/C button on the dash, no light came on, and the compressor wont drive and the condensor fan wont turn. I followed the wires through the firewall and they disappeared somewhere behind the dash. I wanted to check the fuses for the system, but none were present in the fusebox (located under the dash, right side). I used a test light to see which wires had no current. the A/C relay had one wire without current... I also tested the A/C switch wires, no current from either of them. So I am puzzled as to what this poblem is. I have paid auto electricians to look at the system, they charged me 50 bucks and didnt do a thing.
If anyone had a sierra wiring diagram (86 model) this would help alot...
I jumped the compressor from the battery and it worked... however no cold air blew out of the vents. The evaporator is clean...
Problem after problem....
Any help appreciated
Cheers
