Knocking noise from under the dash(91 chev truck)

Tiny
PRAIRIEDOG
  • MEMBER
  • 1991 CHEVROLET SILVERADO
I have a 1991 chev 4x4 with app.300, 00 km. Every time I start or shut the truck off a knocking noise comes from under the dash by the glove compartment. It only lasts for 30 seconds. If I lie on the passenger floor I can feel were the noise is coming from but I can't figure out how to get at it.
thanks
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Monday, November 12th, 2007 AT 6:50 PM

4 Replies

Tiny
STEELWEELS
  • MEMBER
I am having the same problem exactly as you described on my 91 gmc, I have been told something about the temp control or something like that, but it seems noone knows for sure, I cant figure it out.
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Sunday, November 18th, 2007 AT 9:02 AM
Tiny
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I messed around with the controls and it seems that it has something to do with the recirculate button. It doesn't knock when the rec button is pushed in. Try this on yours and let me no if it quits.
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Monday, November 19th, 2007 AT 6:36 PM
Tiny
STEELWEELS
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I seen your message, did this take care of the problem? The REC button, I thought was to just recirculate the air from inside, I dont really care about the noise, I would just like an answer on what may be wrong and if it can be fixed, right now I dont have time to mess with it, right now the frame was rusted enough, that the idler arm(i think that what it is) that bolts to the frame on pass. Side, pulled the bolts out, and now I have no steering, I have temporarily fixed it, but not safe, so I need to find out if there is something else wrong to put so much force on these bolts to rip them out. Stay in touch on the heater matter, thanx, Dan
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Thursday, November 29th, 2007 AT 8:59 AM
Tiny
PRAIRIEDOG
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Sorry
I haven't had time to mess with it either. I'm going to try and unhook the rec. And see if it gets rid of the clicking sound.
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Thursday, December 6th, 2007 AT 12:27 PM

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