Question about 1998 Chevrolet K1500
I am trying to find out if there is a way to test for PCM problem causing the ac not to work. symptoms. NO control over the doors that move air from floor to upper vents. AC button will not engage clutch on compressor. Fans operate. freon level good. I bypassed the relay that engages compressor clutch and it will engage. It seems to be leading to the computer.
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
Posted on Nov 04, 2008
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Posted on Jan 02, 2017
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