Question about 1998 Chevrolet Blazer
The system is charged with refrigerant (and holding), relay switch is good because I've changed it out, Clutch engages and stays engaged when I "jump" power at the fuse block. How do I troubleshoot the problem?
On the Ac system is a low pressure switch ,sounds like its faulty so fit a pull or flick switch from ignition supply and run this direct to the pump
Posted on Jul 25, 2013
Testimonial: "You got it! I jumped the connection at the switch and the clutch engaged perfectly. I'm assuming that I can leave the connection jumped and just bypass the sensor since I know that the pressure isn't low? It'd be much easier (and cheaper) to plug the gauge up every few days to check the pressure."
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Posted on Jan 02, 2017
SOURCE: I have a 1992 chevrolet
The pressure switch will open when freon pressure is too low, the compressor clutch is controlled by the computer or module.
The switch isn't necessarily bad, you can check it with a multimeter. The fitting it is threaded onto should have a valve inside and an O ring to seal so no freon loss should happen when removed.
Posted on Aug 23, 2008
SOURCE: ac not working
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
check the low side switch located on the ac receiver drier for 12 volts if so jump it with a paper clip if the compressor comes on then the relay is good if not the relay is in the fuse junction box under the hood.Most likely the pressure sensor.
Posted on May 23, 2009
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