Every time I go over a bump a hear a whistle type sound coming from the air vents - almost like a chirp. When I turn the air cond. off I no longer get the whistle/chirp sound going over small bumps in the road. Any ideas? Valves in the AC? AC works normally (finally).

Thanks

Mark E.
Ft. Lauderale

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Mark E.
Miami, FL
2 X 1997 C280

WELL I DON'T KNOW WHAT MODEL CAR YOU HAVE, BUT IT MIGHT BE A POSSIBLE LOOSE BLOWER, OR A PARTICLE IN YOUR BLOWER HOUSING.

It's a 97 C280.

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

HAVE YOU PULLED OUT THE A/C FILTER TO CHECK FOR LEAVES OR ANY OTHER DEBRIS.

By the way WRM, typing in all caps is similar to yelling in the e-world!

Turn that jet engine off in the background so you don't have to yell! :p

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

sorry, i don't spend my life behind a computer!

WRM - thanks. Yeah, the A/C filter was replaced 2 weeks ago. On occasion when I shut the AC off, as the vents close the chirp/whistle occurs then as well. Kinda like someone blowing on an empty coke bottle - gets higher in pitch as the vents close. The blower motor sounds ok. Weird.

Mark E.
Ft. Lauderdale

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Mark E.
Miami, FL
2 X 1997 C280

Oh yeah - David Klasse - thanks for looking out for me - you knew my make and model! I guess I've posted quite a bit on here. I've relied on you and others to take the guess work out of C280 ownership. Thanks guy!

Mark E.
Ft. lauderdale

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Mark E.
Miami, FL
2 X 1997 C280

Mark,
No problem! I'm glad I could help.

WRM,
I know G-Benz doesn't intend on sounding rude in any way. It's just that when the CAPS are on, it's more or less like "yelling" on the internet. I'm sure he didn't mean to offend you. Regardless, your help is greatly appreciated! :p

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)