Fuses in 86 sierra... ??? no cold air blowing???

[beaver700]

Posted: Mon Feb 13, 2006 12:13 pm

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Gday,

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

[wayne74]

is it an original system or aftermarket that was fitted ,it could be low on gas some systems have a pressure switch fitted if the gas level is low it will switch the system off.

[wayne74]

is it an original system or aftermarket that was fitted ,it could be low on gas some systems have a pressure switch fitted if the gas level is low it will switch the system off.

[beaver700]

Gday mate,

The funny thing is on this system, is that I cant locate the pressure switch... in the Haynes manual it says its ontop of the reciever drier, but there is none to be seen...

Yes the system is aftermarket. So I have no ideas where the fuses are located....

Thanks for your help,

Cheers

[beaver700]

Yes and the A/c has been freshly gassed...


Cheers

[smiley_smoke]

i have a wiring diagram for a 85 drover/sierra.. not sure if that helps mate let me know.

[beaver700]

Gday folks,

Thanks smiley smoke for your offer. I think a wiring diagram for a drover would be similar to that of a sierra? I think that would help. Thanks for your offer mate,

Cheers