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Banned
2004 gmc
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26,181 Posts
Most certainly the fan clutch, but just unplug the harness going to it to confirm it's not the relay. If it stays on high speed, it's bad. Pre-2005 were the ones prone to early failure.

Lots of threads about changing them.
 

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Banned
2004 gmc
Joined
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26,181 Posts
Relays hardly ever fail, but you have a point. Swap 45 and 46 - they're the only two identical ones in the front fuse block. The other one is for low beam headlights and the DRL function.

 
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