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Weird Squeal

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This just started today... I get a strange, fairly loud squeal from what sounds like the engine compartment. The noise starts when the key is switched on (lights on dash but engine is not running). The squeal will last as long as the relays, etc. run then it goes away, about 10 seconds. Once started the noise comes back and is there as long as the engine runs. It does this when the engine is cold and up to operating temp. It"s around 70 degrees here by the way.

What would be running with key on and engine off that would squeal like this?? It sounds like it's coming from the lifter valley but it"s hard to tell.

No SES light on and the truck runs great.

Any help would be appreciated.

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