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mellymel0323
New User
Aug 2, 2015, 11:59 AM
Post #1 of 10
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ac keep blowing fuses
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2008 chevy uplander, 3.9 engine. One evening we notice air was not blowing cold. Check fuses it was blown. Replaced fuse, it was good for a day then it blew again. Since that time it will only stay on for about five minutes and stop. I have checked the wires and the charging systems and can't find anything.
Please help!
Mel
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 2, 2015, 12:22 PM
Post #2 of 10
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Re: ac keep blowing fuses
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Mel - pretty rare to me but think I might just OHM out clutch coil. Oh boy - think it should be about 3.5 to 5 or close to that. If off charts with a check then find out exactly why or bad luck?
T
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Discretesignals
Ultimate Carjunky
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Aug 2, 2015, 12:41 PM
Post #3 of 10
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Re: ac keep blowing fuses
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Also might be helpful to know which fuse is blowing.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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mellymel0323
New User
Aug 2, 2015, 9:30 PM
Post #4 of 10
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Re: ac keep blowing fuses
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It is the 10 am fuse for the ac clutch.
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Tom Greenleaf
Ultimate Carjunky
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Aug 3, 2015, 2:15 AM
Post #5 of 10
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Re: ac keep blowing fuses
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Test like this or one wire to the other to coil. 2 seconds to rule that out IMO. IDK for sure but would bet trauma or heat would be the reason for a failure most often. Might show odd non oily mess or nothing?
 
May not show?
Call it 3.05 - 3.35 +/- @ ~ 68F.
Pic/graphic was there ^^^^
T
(This post was edited by Tom Greenleaf on Aug 3, 2015, 2:25 AM)
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Hammer Time
Ultimate Carjunky
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Aug 3, 2015, 5:09 AM
Post #6 of 10
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Re: ac keep blowing fuses
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Even I don't understand what that says.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Aug 3, 2015, 5:45 AM
Post #7 of 10
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Re: ac keep blowing fuses
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Was in total battle for a good pic. Coil show wires if assembled would give you the plug to check on to the coil. Two other pics didn't stay or leave a red "X" but it's still a blow up of a clutch assy.
Question I wonder is why it would draw too much to blow a fuse but work a little - makes little sense so far. I might expect a mess if clutch bearing blew up and wrecked the whole thing but wasn't mentioned. Chaffing wires, bad plug somehow - would have to look right at it,
T
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Discretesignals
Ultimate Carjunky
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Aug 3, 2015, 10:41 AM
Post #8 of 10
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Re: ac keep blowing fuses
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I had a field coil do that on a Honda, I believe. It would pop the fuse after it ran for a few minutes. I put an amp clamp on and the amps would slowly climb until the fuse let loose.
One theory I propose is that the windings start shorting out creating heat which causes more winding to short until the current overcomes the fuse.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 3, 2015, 10:50 AM)
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mellymel0323
New User
Aug 3, 2015, 2:41 PM
Post #9 of 10
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Re: ac keep blowing fuses
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Thanks for the imforation. I will check the unit it self and try to determine if the coil is gone.
Thanks again....
Mel
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Tom Greenleaf
Ultimate Carjunky
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Aug 3, 2015, 9:54 PM
Post #10 of 10
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Re: ac keep blowing fuses
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Mel - Sorry for lack of good pics to do this. You just need a volt/ohm meter on the two wires where plug goes into clutch. Watch it while just sitting there and running as possible. It must be heat or in use sensitive or would blow fuse right away.
The fix if found that's the trouble is another thing. Idea is just rule it in or out,
T
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