The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

740 problem with HVAC - strange noise from wind - flapper buzzing???

posted by  someone claiming to be jbmitch on  Wed Jan 10 02:22 CST 2007 [RELATED]

First time this happened was this morning. It's definitely speed-related; I tried varying fan speed (including turning if off), heat/AC, inside/out, various vents - no change. The only thing that causes it is exceeding 35-40 mph, when it begins, kind of low-pitched, then increasing in frequency as the speed increases. It really sounds to me as if the flapper vent that lets in outside air to mix with inside air is vibrating. I also notice that gusts hitting the car from the front (it's windy today) raise then lower the pitch. Once I slow below 35 mph, it dies out and goes away completely.

My Volvo mechanic guy is stymied and we're both puzzling over next steps. It's crazy to have to tear the dash down and start replacing stuff without a clue, but that's the only (expensive) solution I've got right now. Anyone who's experienced this and/or can put me on a better track would be warmly welcomed to weigh in about now.

I can be emailed too at (remove no spam): nospamk4iq@att.net






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.