HVAC control panel does not light up

CYNDA R

MEMBER
1991 CHEVROLET SILVERADO
5.7L
4WD
AUTOMATIC
118,000 MILES

We have two panels available to try. Both are black and don’t light up. We checked fuses, they look fine. We jiggled the wires under the hood that go to the panel, but inside it did not flicker on and off at all. We can not locate the LPS fuse to try it. Here is a picture of our fuse box. Where is the LPS located so we can try that?

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2 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Sure is right there - Park LPS here is a guide to help check for power and the wiring diagrams so you can see how the system works.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (Below). Please let us know what happens.

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Friday, April 30th, 2021 AT 4:10 PM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

The Park LPS fuse is 5 amp in the picture you show but it sounds like a bad ground or the HVAC control head is out again is a guide to help check the grounds and the air conditioner wiring diagrams so you see how the system works.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

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