Question about 1994 Chevrolet C1500
When I turn on key the sound starts, and thump- thump- thump- thump-
goes for about 15 seconds then quits. Then when I turn key off, the same set of noises, goes for about 15 seconds.
It is located under the dash, about middle of dash.
I have looked under there and have tried to feel where the thumping is at but I cant find it.
It sounds like a flapper door shutting.
I take a shoot here you can try this. try pulling the fuse or fuses that go to your heater blower and heater controls. If it stops check your heater blower it may be going bad, if you find nothing there, leave the blower unplugged and try turning your key on and see if you still hear it. If so I would think that the heater control is mess up and open and close the air blend door or you may have a wire shorted out under the dash some where.
Posted on Nov 29, 2008
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Posted on Jan 02, 2017
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