Fan relay switch

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[2009]

All settings on the fan work except the highest. Can you tell me where the relay switch is for that high setting on a 1991 Chevy Silverado?

[chevyclub]

It is under the hood on the passenger side underneath the black cover. It looks like a big T. Its underneath. Its one on the relays not sure exactly but it should be labeled on the under side of the cover.