The ac in my 96 cherokee xj turns on and off constantly while using it. the compressor has a kinda loud howl to it when it is engaged, louder than most I have heard. I added some R134a to it and got it up to between 15-20psi like recommended but I now get a "fog-horn" type sound from behind the dash but only when its idling and the ac engages. If I rev the engine the noise goes away for a minute or so. When it makes this "foghorn" type sound the 2 AC lines that go into the firewall vibrate real bad.
What do you guys think? I have googled the problem and found a few people talking about a valve of some sort for the AC behind the dash making this noise but no real ideas or answers. Any help would be highly appretiated!!
What do you guys think? I have googled the problem and found a few people talking about a valve of some sort for the AC behind the dash making this noise but no real ideas or answers. Any help would be highly appretiated!!