Question about 2004 Chevrolet TrailBlazer

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What is a fan speed high code 0495 on a 2002 trail blazer

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The cooling fan on the engine has sensor that might mean that the fan is going faster than normal. Try resetting the main computer by disconnecting the car battery for about 35 seconds. Reconnect the battery. If the code comes back, there may be a problem with the fan. Try replacing it. Remember that when you disconnect the battery, you will loose settings on the clock and radio. Hope this works for you.

Posted on Oct 15, 2010

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2005 Chevy Trail Blazer fan won't shut off


Are you talking about radiator fan, my info shows electro/viscous fan clutch. Can you check for applicable trouble codes? Around here some of the national brand auto stores will check codes for free. My info shows a list of codes for that fan system as long as my arm.
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2003 Chev Trail Blazer. Codes: PO440, P151 & P1481 pull up. what are they?


P0440 = evaporative emissions system leak...check gas cap , hoses

P0151 = evaporative emissions systems sensors (O2 sensor, usually the O2 sensor between engine and catalytic converter on Cylinder Bank 2 (the side of the engine with the even-numbered cyclinders, usually left side from under hood if engine is mounted axially, rear of engine if it is mounted transversely)

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1 Answer

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I think the Envoy has the same setup as the Trail blazer and If so its the fan. I replaced the fan on my parents Trail Blazer 2 times in the 7 years they had it . It would start sounding like an air plain taking off when you would first pull out of the driveway

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