A/C Troubleshooting Tips
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Joined: Nov 1999
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From: belton texas
A/C Troubleshooting Tips
A/C fuse blows (90 model) as soon as you turn system on. This had been a working system 3 months ago before we let her sit my son's graduation from college out. We did not turn the system on during this period. The setup is a very unmolested original system which was converted to 134 about a year ago--new clutch and compressor at that time. It worked fine after this.
Any multimeter check(s) that can be initially made to isolate the area/sections which may be causing the problem. Or can low charge cause clutch to draw too much and blow fuse? It is hot in TEXAS in July withou A/C!
Any multimeter check(s) that can be initially made to isolate the area/sections which may be causing the problem. Or can low charge cause clutch to draw too much and blow fuse? It is hot in TEXAS in July withou A/C!
Le Mans Master
Joined: May 2003
Posts: 5,362
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From: Delray Beach FL
Re: A/C Troubleshooting Tips (dpswmb)
I had a similar problem with my 93. Check the wires leading to the clutch. The wire coating had cracked and come off, leaving the wires bare. They were grounding on the compressor housing causing the fuse to blow instantly. To fix, I just used some liquid electrical tape. Coated the wires and let it dry. Solved the problem until the compressor grenaded itself a year and a half later. Hope this helps!
:steering:
:steering:
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From: belton texas
Re: A/C Troubleshooting Tips (Whitvette)
Took your advice and at least wiggled the wires and installed a new fuse. Started the car and turned on the A/C! Wow, the blower motor came on (it did not work before) in all positions and blew real fine, some cool feeling air was coming out the vents and I noticed some faint smoke in the wire area next to the valve covers near the compressor. Did not like this but thought maybe it could be some oil blowby or worst case a wire getting ready to catch fire? Finally shut it off and checked the fuse which did not blow. Inspected the wires as best I could and did not see anything, checked the fuse which did not blow and restarted the car. Again, blower came on fine, no smoke whatsoever but real hot air blowing.
Going to do two things one of which I really just don't want to do. First, I guess I will 134 charge the system and reluctantant take some air pump hoses of and try and look deeper into the clutch feed wires for damage or something--at least back to near the distributor. If none of this works out, I guess I am looking for "some expert-type" advice on some checks behind the firewall/in-dash area? What next--oh, my cooling fans don't come on but they do work. Hopefully, relay replacement is all I will need!!!!!!!!!!!!!1 :nopity
Going to do two things one of which I really just don't want to do. First, I guess I will 134 charge the system and reluctantant take some air pump hoses of and try and look deeper into the clutch feed wires for damage or something--at least back to near the distributor. If none of this works out, I guess I am looking for "some expert-type" advice on some checks behind the firewall/in-dash area? What next--oh, my cooling fans don't come on but they do work. Hopefully, relay replacement is all I will need!!!!!!!!!!!!!1 :nopity
Le Mans Master
Joined: May 2003
Posts: 5,362
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From: Delray Beach FL
Re: A/C Troubleshooting Tips (dpswmb)
I used some electrical spray cleaner to clean away the dirt and oil off of the wires at the clutch. Then a little liquid electrical tape. It will seal up the wires. The smoke may have been from oil on the wires. If all you did was wiggle the wires and the fuse didn't blow, that is where your problem lies. I don't think you need to worry about getting into the wiring harness at all. Just seal up the wires and enjoy the nice cool air blowing inside your Vette!
:seeya Hope that works for ya!
:seeya Hope that works for ya!
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From: belton texas
Re: A/C Troubleshooting Tips (Whitvette)
I know you are right and feel sure the problem will quickly reveal itself once I get the wires cleaned up a little. Everyone has a sad song to sing--I have been cleaning and readying the 90 for my son so he can take it from his weeding this weekend. She looks new and the 90 is really a nice car. My real problem is that I have a 58 taken down to bare, bare, bare bodyoff, a 72 convertible ready to lift the body off and my wife's 84 just completed with a late model rebuilt 350, ready to prime and replace carpets and seats. Good thing we all love these Corvettes so much--don't you just hate it. Bll
And, I just bought a pontoon boat which I have to pickup and wondering when am I going to get the time to take it to the lake which is across the street! Isn't life tough. :thumbs: no need to reply thanks much
And, I just bought a pontoon boat which I have to pickup and wondering when am I going to get the time to take it to the lake which is across the street! Isn't life tough. :thumbs: no need to reply thanks much
