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Thread: Knocking in Heater / AC Duct
03-09-2010, 02:11 PM #1
Knocking in Heater / AC Duct
I have a 94 Silverado, regular cab, with ac. I have just developed a rhythmic knocking in the heater / ac duct when the vehicle is started and shut off. I got down there and felt around while it was doing this and found a duct door on the far passenger side toward the bottom of the duct box and could feel it in this door. Any thoughts? Were there any service bulletins on this that anyone knows of? Thanks.
Jim1994 Silverado 1500 2 wheel drive 350 TBI Auto (4L60E). Standard Cab / Bed, all power.
Impala SS Club of America Member# 2122
03-11-2010, 07:45 PM #2
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- Jan 2010
03-11-2010, 09:13 PM #3
Its kinda annoying. My 95 and my buddys 94 does it it.1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes
03-12-2010, 06:40 AM #4
My '05 does it too, on my mine I can slide the drivers side temp. control up one notch and it quits.Adam
03-14-2010, 10:31 PM #5
OK. I found some other information which confirmed that it is the cold air blend actuator motor. A common problem, I am finding. I was a professional mechanic in the 80's through 95 and never had to deal with this back then. I will take pics and let everyone know how it goes. Thanks for the help.
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