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ALbert G 11-20-2007, 06:08 PM When I have the heat or A/C on in my dually it seems to make a randon thumping sound every 30-60 seconds..seems to be near the center of the dash under the windshield...driving me crazy!! Does not happen when heat-A/C is off. Anyone else experience this?..or is it time for another trip to the stealer! Thanks Albert nekkidhillbilly 11-20-2007, 09:34 PM mine does this with the heat on sometimes Blk04HD 11-20-2007, 09:45 PM x2 All of my HDs have done it, nothing to worry about. It is, or can be kind of annoying though. linework 11-20-2007, 10:23 PM X3. I drive an 06 gasser at work. It has the same noises. Just turn up the radio. It will go away! :D:D TheBac 11-21-2007, 06:46 AM Probably one of the doors moving inside the HVAC ducting. red neck 11-21-2007, 06:26 PM exactly awcurl 11-22-2007, 11:25 AM It's the damper actuator continually attempting to close the damper. ALbert G 11-22-2007, 02:40 PM It's the damper actuator continually attempting to close the damper. any idea on what the fix is..driving me nuts! 04blackgmc 11-22-2007, 03:14 PM hmmm ive heard mine do it many times.. i just dont worry about it. TheBac 11-22-2007, 06:23 PM You may want to ask the dealer if there is a TSB on the problem. It could be something faulty in the HVAC control head. Does it happen on regular heat/AC or just on certain settings? Maybe just on Recirc? DIESAHL 11-22-2007, 07:49 PM mine only does it on defrost TheBac 11-22-2007, 08:50 PM That would make sense...as the diverter door has to move when you select defrost. But if its clunking intermittently, then I'd think that was either a sealing problem with the door, a bad actuator or a bad head unit sending stray signals out. 07BlackSilveradoHD 11-22-2007, 09:49 PM all three of our trucks do it. | ||