Heater clicking

Tiny
SHOVEITORLEAVEIT
  • MEMBER
  • 1995 GMC SIERRA
  • 200,000 MILES
I turn on my truck and there is a clicking for 30 seconds from under my pasanger side dash. Then it does it when I turn the truck off what do I do.
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Wednesday, November 9th, 2011 AT 1:03 AM

3 Replies

Tiny
DRCRANKNWRENCH
  • EXPERT
A possibility to check is to see if leaves and debris have gotten through the fresh air box, the grate in front of the windshield wipers, where it goes down into the blower motor.
Disconnect the battery and then remove the lower box cover the get to the fan. Remove the blower fan and see if a bunch of leaves, etc. Come with it.
If this is the case the box should be cleaned out while you are at it. If you have a shop vac, use it to suck out as much of the box from under the dash as possible. IIt is the build up of leaves that you heard rubbing on the motors blades.
After years the air box gets debris in it and startys to get into the interior heater box. The other problem, which is more important, is to check the weep holes that are at either end of the box and exit right above each front fender.
After time they will get clogged. When this happens rain will not be able to drain out of the box through the weep holes and evebntually back up and flood into the interior.
The best you can do here is an air compressor with a blower tip on it or a high pressure washer. The best way is to take the fenders off and clean it properlay and make sure they both drain.
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Wednesday, November 9th, 2011 AT 1:14 AM
Tiny
91SIERRA
  • MEMBER
Did this work? Do you have heat now? I have the same problem.
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Wednesday, January 11th, 2012 AT 2:19 AM
Tiny
DRCRANKNWRENCH
  • EXPERT
You can also check for leaves touching the blower motor by going into the hairbox, right box covering A/C evaporator right side under dash. Remove the panel and you can see the vent and the bottom of the motor. You should be able to disconnect the elctrical, un bolt it and at least allow it to drop down to inspect it and leaves or debris will be apparant and can be vacuumed out from there.
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Wednesday, January 11th, 2012 AT 2:52 AM

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