A/C Compressor Does not Work?
Thread Starter
Instructor
Joined: Mar 2008
Posts: 221
Likes: 0
From: Farifax Station VA
A/C Compressor Does not Work?
I am attempting to disect my A/C system under the hood. When I move the A/C control lever to MAX, the fan switches automatically to high, but the compressor does not engage...is there a relay or some type of connection that I can look for?
Drifting
Joined: Apr 2008
Posts: 1,305
Likes: 2
From: Lewisburg WV
thegazman
There's a low pressure switch in your system. You will see two wires attached to a pressure switch near the evaporator on the passenger side of the car in the high pressure line running from the condenser along the fender well. When freon pressure is too low this switch opens and does allow the compressor to run. As a test...unplug the wires from the pressure switch, make jumper out of a short piece of wire, plug it into each side of the plug. Try the compressor, if the compressor then runs, you are low on Freon
Thread Starter
Instructor
Joined: Mar 2008
Posts: 221
Likes: 0
From: Farifax Station VA
There's a low pressure switch in your system. You will see two wires attached to a pressure switch near the evaporator on the passenger side of the car in the high pressure line running from the condenser along the fender well. When freon pressure is too low this switch opens and does allow the compressor to run. As a test...unplug the wires from the pressure switch, make jumper out of a short piece of wire, plug it into each side of the plug. Try the compressor, if the compressor then runs, you are low on Freon
Safety Car
Joined: Oct 2000
Posts: 3,547
Likes: 12
From: Carbondale Pa.
Safety Car
Joined: Oct 2000
Posts: 3,547
Likes: 12
From: Carbondale Pa.
You are jumping the wires that the switch is connected to, unplug the wires from the switch and use a cotterpin or a paperclip to take the place of the terminals on the switch. You are essentially bypassing the switch, O.K. ? Peace,,,Moosie
Thread Starter
Instructor
Joined: Mar 2008
Posts: 221
Likes: 0
From: Farifax Station VA
I think I am making this more difficult than it it. I have the AIM in front of me and am looking at the pic of the switch. From what you explain, I am going to connect a wire from the switch terminals to the compressor? is that right? Since the switch is inline with the valve, I am confused as to how to bypass it -- sorry this is so painful!
Safety Car
Joined: Oct 2000
Posts: 3,547
Likes: 12
From: Carbondale Pa.
Disregard the switch, you are wanting to BYPASS the switch, your jumper wire/clip or whatever is to be connected into the wire terminals where the switch once was connected, it isnt difficult. Again,,,Good luck, Peace, Moosie
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Safety Car
Joined: Oct 2000
Posts: 3,547
Likes: 12
From: Carbondale Pa.
the wire is taking the place of the switch, you are bypassing/jumping the switch, insert one end of your jumper into the end of the terminal on the wire that was disconnected from the switch and the nother end of your jumper into the other terminal, sorry if I am not to clear but I know that when I speak my 20 yr. old son gets it,,, so does my 19 yr. old daughter,,,,their mom on the other hand looks at me like I am talking vulcan or yiddish or even greek. Peace,,,Moosie
Thread Starter
Instructor
Joined: Mar 2008
Posts: 221
Likes: 0
From: Farifax Station VA
OK...here goes! thanks again. I'll let you know the outcome. My 14 year old son, constantly wows me with new facets of the English language. Anyhow, aren't these older vettes fun? Cheers.
Drifting
Joined: Apr 2008
Posts: 1,305
Likes: 2
From: Lewisburg WV
thegazman
I just got home and answered you PM. Sorry about the delay. And when switch is open it "does not allow' the compressor to run. I see by your post you have figured it out. Unless you are familiar with a/c systems you will need a professional to put a set of gauges on the system and like moosie982 says it may also low on oil. Good luck.
Ken
Ken