My a/c quit working because the clutch quit engaging the ac work perfect then one day just stopped . I thought it might be the relay . if anyone has a sugestions where to start looking for the problem?
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Get out your owners manual and locate the power relay for the AC and remove it, this will stop the AC clutch from engaging the compressor, note, AC is used in winter to help remove moisture when defrost is on you may have to roll window down to prevent fogging, also check for blown fuse in manual bet you find one for instrument cluster, good luck,Bret
Did you check the AC relay? Usually located under the hood, try swapping it with another relay with the same part number that isn't required to run the vehicle. If the AC now works, then replace the relay. If not , then verify compressor operation. With the engine running, watch the compressor clutch while someone else turns on the AC control. The clutch should engage and begin to run. If not, then find the pressure cycling switch usually located on the accumulator. Disconnect the harness and jumper the contacts. With the engine off and the key turned on , turn the AC control on. You should now be able to watch the clutch engage and disengage by removing and replacing the jumper lead. If it does, then replace the switch. I hope this information is helpful. Thanks for trying Fixya.
The compressor clutch will not engage if the r134a is low
You need to charge your system.
Most systems require that you turn on your A/C once a month even in the winter
This helps keep the seals in working order.
Hope this helps FixYa
if you by passed the relay and clutch engaged then this shows that pump works ??but was it getting cold on and around the restrictor valve where the pipes enter the cab is normally a valve block but american monsters use a valve in the pipe for cooling and if its not getting cold their or blowing cold inside cab then system needs re-gassing with R 134 gas if its an older system with R 12 gas then it will need to have adaptors fitted to valve connections and refilled with R134 gas.The main cause of A/C system loosing gas is porosity in the rubber flexible pipes also the back seal on the pump.Or just regass and put a leak stopper in the system