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Old 07-18-2019, 09:34 AM   #1
mdbrill
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Default Running A/C without A/C diode in fuse block.

Hello,

I recently diagnosed an issue with my A/C fuse constantly blowing. I figured out that it was the AC diode that goes in the fuse block. With it out, the compressor runs great and no more fuse popping. I ordered a new diode. Can I run my A/C without it, until the new one comes in the mail, or is that too risky?

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Old 07-18-2019, 10:06 AM   #2
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Default Re: Running A/C without A/C diode in fuse block.

Can you find one locally?
The diode is there to protect the rest of the cars electronics from an induced voltage surge when the clutch is de-energized.
A diode is basically a one way valve for electricity, the normal power can pass through to energize the coil, but the induced backflow voltage is blocked. Your computer needs protection from such a surge, as they are very sensitive to it.

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Old 07-18-2019, 10:28 AM   #3
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Default Re: Running A/C without A/C diode in fuse block.

I would not. Besides computer stuff you will fry your relay and expose the clutch circuit to big voltage spikes.

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Old 07-18-2019, 11:17 AM   #4
OldNuc
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Default Re: Running A/C without A/C diode in fuse block.

You will only do it a couple of times.

Any decent parts store has them or any Chevy dealer.

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Old 07-18-2019, 02:45 PM   #5
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Post Re: Running A/C without A/C diode in fuse block.

Go to a junk yard and you'll find them in fuse boxes. Pick a GM model, any model and pull the diode out for your car. If you find a Saturn, pull the diode out as the closest match.

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