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Ac Fuse Blowing

EliseViv

By EliseViv,
in General Maintenance

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EliseViv Enthusiast

EliseViv

Posted
Posted

Hello Peeps,

Thanks to the community knowledge base, I have successfully got my AC working well again (9C at the vents on FC :-)), and documented the fix at the end of this link.

http://www.sau.com.au/forums/topic/199591-aircon-regassers-in-melbourne-that-use-hychill-hr12-gas/

The problem is I now have a problem with the AC fuse (which appears to power the AC electromagnet) blows after about an hour of operation.

The last time I was probably lucky that I didn't get a fire as it melted the spade fuse in the fusebox?!?

So back tot he collective. Anyone know where I might start to diagnose this?

1989 R32 GTST - Bog standard.

Thanks

Brett

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89CAL Grand Master

89CAL

Posted
Posted

magnetic clutch is farked

Most likely scenario

You have the right size fuse in there? If its melting I dare say there is a fair current draw so probably right fuse if not higher.

Only thing I would suggest is meetering from one end of the circuit to the clutch to check if there is any resistance in the wire. It wont completely eliminate this but will help

Ac belt not too tight?

Not too many things it can be. Id watch the clutch when its engaged and see if its slipping. Maybe pull the belt off, engage the clutch and see if it spins ok

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jiffo Mentor

jiffo

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Posted

If it consistently blows the fuse after that same time you're probably on the money with a short to ground in the mag. clutch coil.

The clutch circuitry runs from the 10A fuse to the relay then to the mag. clutch.

Lots of places for damage along the way, any of which will blow the fuse but if it's a consistent time interval, more likely to be the coil.

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MrStabby Grand Master

MrStabby

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Agree with all the above. Measure the resistance of the mag clutch solenoid. On the 32 GTRs it should be 3.5 ohms, I imagine it would be the same on yours. If its much lower than 3.5 it will pull too much current and blow the fuse. When mine went I found info on here that they can be re-wound, but i just got a good second hander.

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