Question about 2003 Chevrolet Silverado 1500
Heater blower makes tapping sound after starting and shutting engine off.
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Posted on Jan 02, 2017
there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate
Posted on Oct 04, 2008
For location and replacement of the BMR. Remove the shroud below the glove box, 2 screws and a snap-pop fitting. Be careful of the courtesy light. Remove the blower moter and disconnect the power harness - - you'll need this extra room to work with. 2 more screws, same size, 7/32, 6.5, 7or 8mm on some, that holds the blower motor resistor in place. This replacement part is less than 40 bones at most parts store. Unplug, replace, re-install, test and you're on your way with about 2 hours of slow paced effort in your own driveway. Typical cost at a garage/dealer - up to $400.
Posted on Mar 19, 2009
Check the resistor first. It may be bad. Should be under pass. side of the dash close to blower motor mounted in bottom of evap case. Remove it and try known good one first before going at the switch. If it works on high then the switch may be okay. Good luck.
Posted on Jun 06, 2010
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