Chevrolet Corvette Stingray C7 Forum - View Single Post - HVAC Moisture On Windshield On Going Problem?

camaro5 · 11-14-2017, 09:33 PM

The hvac case was inadequately designed so that the mode door could not contain the Blower cfm's at high fan speed.

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

The solution was to ADD little foam blocks to hold the mode door open further than it's normal leak rate, so it wouldn't make the flutter sound at high fan speed.

Then, more complaints about air on windshield.

Ineffective TSB was released to remove added foam blocks, and reprogram BCM to lower fan speed cfm for high speed setting.

The mode doors still leak.

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

Poor visibility through the windshield is not only maddening, it is an outright safety hazard.

I'm going to check this BEFORE taking delivery, and will NOT buy ANY car fogging (inside) and causing blinding condensation (outside) on its windshield.

Put a little more foam on the MODE door.

v

11-14-2017, 09:33 PM	#4
camaro5 Drives: X-15 Velocipede Join Date: Mar 2008 Location: SW Florida Posts: 4,630	Leaking AC Mode Doors The hvac case was inadequately designed so that the mode door could not contain the Blower cfm's at high fan speed. This causes a fluttering mode door and the obnoxious sound that goes with it. The solution was to ADD little foam blocks to hold the mode door open further than it's normal leak rate, so it wouldn't make the flutter sound at high fan speed. Then, more complaints about air on windshield. Ineffective TSB was released to remove added foam blocks, and reprogram BCM to lower fan speed cfm for high speed setting. The mode doors still leak. Door needs more foam weatherstripping. Might be able to get the actuator to pull it tighter. Poor visibility through the windshield is not only maddening, it is an outright safety hazard. I'm going to check this BEFORE taking delivery, and will NOT buy ANY car fogging (inside) and causing blinding condensation (outside) on its windshield. Put a little more foam on the MODE door. v __________________ 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.