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camaro5 · 10-25-2017, 04:05 PM

The story is deeper than that.

They poorly designed the hvac case so that the mode door could not contain the cfm's at high speed.

This causes a fluttering mode door and the sound that goes with it.

Duh, their solution was to ADD little foam blocks to hold the mode door open so it wouldn't make the flutter sound at high fan speed.

Duh, too many complaints about air on winshield, duh,

TSB to remove added foam blocks, and reprogram bcm to lower fan speed cfm for high.

Duh, it still leaks - sad failed engineering AND follow-up actions.

Door needs more foam weatherstripping. Might be able to get the actuator to pull it tighter.

Worst part: Had this on my new 1984 Camaro Z28, had to get a job in service to get many issues fixed.

And this was one of them. Necessary to remove entire IP to add weatherstripping to door. Worked perfectly. Needed more foam, no more adjustment left.

34 years later! Duh, windshield? Duh, defroster leaks?

g

10-25-2017, 04:05 PM	#459
camaro5 Drives: X-15 Velocipede Join Date: Mar 2008 Location: SW Florida Posts: 4,637	The story is deeper than that. They poorly designed the hvac case so that the mode door could not contain the cfm's at high speed. This causes a fluttering mode door and the sound that goes with it. Duh, their solution was to ADD little foam blocks to hold the mode door open so it wouldn't make the flutter sound at high fan speed. Duh, too many complaints about air on winshield, duh, TSB to remove added foam blocks, and reprogram bcm to lower fan speed cfm for high. Duh, it still leaks - sad failed engineering AND follow-up actions. Door needs more foam weatherstripping. Might be able to get the actuator to pull it tighter. Worst part: Had this on my new 1984 Camaro Z28, had to get a job in service to get many issues fixed. And this was one of them. Necessary to remove entire IP to add weatherstripping to door. Worked perfectly. Needed more foam, no more adjustment left. 34 years later! Duh, windshield? Duh, defroster leaks? g __________________ Go from the presence of a foolish man, when thou perceivest not in him the lips of knowledge General Motors ASEP, A.S. Automotive Technology, Telecommunications Specialist, CISCO Network Engineer STANDARD DISCLAIMER camaro5 is furnishing this information "as is". camaro5 does not provide any warranty of the information whatsoever, whether express, implied, or statutory, including, but not limited to, any warranty of merchantability or fitness for a particular purpose or any warranty that the contents of the information will be error-free.