Question about 2004 Chevrolet Silverado 1500 Crew Cab
I thought we had problem of blower coming on with truck off nailed down to resistor. However until we had a chance to remove it, we pulled the fuse. Since it's freezing here, reinserted fuse while driving. Later, stopped vehicle, removed fuse. Got back in vehicle forgetting to reinsert fuse and heater blower fan works correctly on all speeds except 5. Help with this one. It's as if removing the fuse corrects all the problems.
The Highest fan speed is applied through a relay that is part of the resistor assembly, and the fuse provides unswitched 12-volts to the relay. The relay contacts are most likely welded closed, causing the blower to run on high whenever the fuse is in play. If you feel lucky, you might give the relay a rap with a tool handle to try and dislodge the contacts. If this is successful, you may use the blower as normal until the problem re-occurs, as it probably will. The only real solution is replacement of the relay/ resistor.
Posted on Dec 18, 2008
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Posted on Jan 02, 2017
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