A/C won't work. Please help

[1fast87gn]

The a/c compressor wont turn on.
I checked the relays and pressure switch on the accumulator.

At the relay the wire coming from the ecm has no signal ( or its very week.

What could it be for the ecm not to send the turn on signal?

Any help would be appreciated.

Steve

 

[salvageV6]

Check the ECM/SOL fuse first.

 

[S10xGN]

I managed to "smoke" that circuit in my stock ECM while loop testing my A/C by inadvertently applying 12V to the blue wire (which grounds internally). Went to Advance and bought a replacement ECM because of an entirely different problem, and YES that ECM had a smoked A/C circuit too!

On my hybrid swap, I ended up "hot-wiring" the solenoid, in effect bypassing the A/C "turn-on" wire (blue) and triggering the A/C with the green wire which comes from the A/C switch. Not sure on the GN, but on the S-10 wiring, the fuse and wiring will handle the added load of the compressor.