My air conditioner compressor clutch is not receiving 12V power when I turn on the A/C. I have not yet started to chase down the problem as the engine compartment was too hot to mess with. I just did an archive search of the forum and found a thread back in 2010 to which Bret Wolfe wrote about the high pressure and low pressure safety interlock switches as well as a relay. My first suspicion would be the relay or a fuse, if there is one. The basic wiring diagram I have does not address this circuit. Can anyone tell me where to look for the relay or a fuse in my '99 U320 36 foot coach?
Thanks,
Richard
The dash A/C clutch circuit is in the wiring diagrams in your owners binder. Follow that. Starts at switch in dash, may go thru thermostat on coils, and goes thru various high/low pressure cut-off switches and then to compressor (or a relay, I forget). I do know a relay piggybacks on the circuit to run the condensor fan.
Richard,
The breaker should be mounted on you isolator panel. There should also be a breaker next to it for the alternator along with the relays that control the compressor clutch and condenser fan.
Your B-2126 drawing should show it.
Pamela & Mike
If you are low on Freon there will be no power to the clutch.
Or maybe a bad low- pressure switch. Jumper the wires together and see if the clutch engages.
Thanks so much for the suggestions. My coach is back in storage right now but now I have a starting point for trouble shooting when I get back down to it.