A/C Clutch Fuse blowing- no cold air

[rsm688]

Hey guys, need a guru's help on my A/C in my 08 Alpha. It has been sitting a hot minute other than being cranked to keep the fuel system moving. Everything worked fine before but A/C is not blowing cold.
Freon is good.
A/C clutch fuse (48) blows every time I swap it so obviously something electrical somewhere.
Replaced relay no luck.
Ordered a new diode and a new HVAC control unit (the control unit in cabin with the 3 HVAC knobs as I know that was an issue with my last H3) that I am going to swap in when they get here in 4 days and then will replace the fuse again and see what happens.

Anything else I should check?


Thanks,
Spencer

 

[deserth3]

HVAC controller talks to the computer. Pretty sure that has nothing to do with blowing that fuse. But I don't have that schematic.

Easy troubleshooting. Unplug connector going to compressor clutch. Replace fuse. Turn on ac. If fuse doesn't blow its a good bet your ac clutch coil is bad.

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[rsm688]

Thanks I will try that out! Is replacing the clutch coil any easier than replacing the compressor? If it's bad may just replace the whole compressor unless the clutch is easier to do

 

[deserth3]

I don't think you can change just the clutch coil. I believe you have to change the whole compressor.

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[Jeepwalker]

You might ohm out the AC clutch coil. Should be between 2-5 ohms according to a google search:
"Typically a clutch coil should be between the range of 2 to 5 Ohms, and any reading below 2 Ohms or over 5 Ohms indicates a bad coil. A reading of 0.00 indicates that there's a short in the windings."

https://www.freeasestudyguides.com/ac-clutch-coil-test.html


Clutch kit:
https://www.ebay.com/itm/264675996006


If it ohms out ok, you could apply 12V to the clutch contacts and see if the clutch pulls in ok. Sometimes to change compressor clutches, a guys has to fab-up a special clutch holder to get clutches off. If you don't have the shop resources/pullers, it might be quicker to take it to an ac place. It's usually pretty quick if you've done it a few times and have the tools right there. And maybe you have....

Best of luck. Let us know what the problem turns out to be and how you solved things.