AC blowing fuses (1 Viewer)

[MacMan]

The AC in my newly acquired '92 FJ80 did not work. I checked the fuses and the AC one was blown. I replaced it and it blew as soon as I turned on the AC. Any suggestions where to start diagnosing this problem?
My other question:
How hard is it to install an ARB front bumper or should I have a professional do it?

 

[1972FJ55]

HI,
I can't answer for the ARB, although I wish I had one so I could. As far as the A/C, I'd start with the wire at the compressor. Try disconnecting the plug at the compressor, and see if it still blows the fuse. If it does, you probably have a bad clutch coil. If it continues to blow the fuse, that wire may have an open short.

This will at least get you started. Good luck!
Rex

 

[CJF]

Try disconnecting the plug at the compressor, and see if it still blows the fuse. If it does, you probably have a bad clutch coil.

x2.

Bad clutch coil is what was causing my AC fuse to blow in my Toyota Cressida.

There should be a resistance specification listed in the FSM that you can easily check with a multimeter; mine clearly failed.

Curtis

 

[flow]

hi guys,

Im reviving this thread because my truck is blowing the 10 amp a/c fuses as soon as the a/c is turned on.

I just got the truck back from my local shop of choice and they said that the system holds a vacuum but the 10 amp fuse would burn up immediately and a 30 amp fuse would hold only for a few seconds. They also said that the fix is to replace the compressor...for around 600 dollars. WOW! Coolstream will be getting a call from me if that is indeed what i need to do; their list price for the Denso #471-1166 is waaaaaaay less at $260.

My questions: How exactly do I diagnose a bad clutch coil? Does a bad clutch coil necessitate a new compressor?

For Rex from Coolstream: I dont think I understand your post above, do you mean to disconnect the plug on the compressor to bypass a short on its wires? that would mean that the short lies away from the compressor, correct?

Thanks in advance for any help.

 

[tirewater]

You probably have a bad clutch. Pulling the plug on the compressor will prevent the clutch from engaging the compressor. Although that simply leaves an open circuit so the fuse will never have electricity flowing through it, so it's not necessarily a fault proof diagnostics.

I didn't see a resistance chart, which would be a better check. The FSM has a test, although I wouldn't do it if the you're blowing a fuse. If the clutch has failed you'd be shorting the battery to ground in the test.

 

[flow]

So after looking over the FSM reference I have bookmarked here, I will look at the lead wires to the stator and to the clutch.

If it is the clutch, can I replace it alone? I dont see our clutches for sale a la carte.

 

[CJF]

How exactly do I diagnose a bad clutch coil?

By checking the resistance.

Surprisingly though, I *don't* see where that specification is listed in my FSM.

Does a bad clutch coil necessitate a new compressor?

Absolutely not, unless it's a mechanical (bearing) failure rather than an electrical failure.

Curtis

 

[CJF]

I dont see our clutches for sale a la carte.

Probably called a "stator".

 

[flow]

Thanks Tirewater and CJF for your help. Ive now got a good handle on all the a/c components
and their synonyms.

I cant find a test procedure from the FSM anywhere. Any links?

CJF, where did you get your new clutch coil?

 

[jdayment]

Mine was doing the same thing a few weeks ago it ended up being an exposed wire that kept making contact with the compressor itself if you look at the top of the compressor and follow the wire that runs into the fuse box check there for any exposed wires. It cost me one piece of electrical tape to fix.