Fuse blows when the A/C is turned on

Tiny
ITADEBBIE
  • MEMBER
  • 2008 CHEVROLET UPLANDER
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
And it blows hot air.
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Saturday, May 7th, 2022 AT 2:03 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Is it the 10 amp (fuse 6) in the under-hood fuse box? If so, that is what powers the compressor clutch, via the compressor relay.

If it fails when you turn the A/C on, there is likely either a short between the relay and compressor clutch or the AC clutch is bad. Also, this fuse will prevent the A/C compressor from being engaged, so you won't get cool air in the vehicle.

I attached the wiring schematic below, so you have a reference. What I need you to do is this. Remove the relay and switch it with a different one having the same part number to see if that prevents the fuse failure. If there isn't one, here is a link that explains how to test one:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If it does, move to the compressor clutch and disconnect it. Replace the fuse and relay and see if the fuse fails. If it does, there is a short between the two items. Inspect the wiring for damage and the connector at the clutch for concerns.

If it doesn't, check the connector at the clutch for damage or indications of it shorting. If there is no issue found, suspect the clutch is bad.

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below.
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Saturday, May 7th, 2022 AT 10:52 PM

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