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Old 04-29-2002, 10:10 PM
Registered User
Join Date: Jul 2000
Posts: 72
86 300E - center vent closes on aceleration

I suspect my 86 300E has some vacuum leaks in the elements controlling some of the ACC flaps.
1) Under aceleration my center vent stops blowing and air comes from the defrost vents.
2) Recirculation is inoperative
Any suggestions?
Thank you and best regards,
Joe Brasileiro
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Old 04-29-2002, 10:21 PM
J.HIDALGO's Avatar
Registered User
Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Check the vacuum lines...

by the firewall driver's side, by the brake fluid.
Good luck!
'86 300E
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Old 04-30-2002, 04:42 AM
David C Klasse's Avatar
CheFrac is Back!
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
I have the same 2 symptoms on my 95 C280!

Recirculation flaps stay open at all times.... letting air into the car from the side and defrost vents, more air the faster I drive.

Also, when I have the AC on, the center vents close when I accelerate!

I also hear a slight humm sound of some sort when the climate control is OFF, and this sound goes away when I turn the CC on.

I am able to retrieve codes via the CC unit, luckily.

The codes I keep getting are:

60: A/C Compressor, Electromagnetic Clutch (A9K1), CAUSE: Short Circuit. Intermittent.
82. Switchover Valve Block (Y11/3), Tempering Flap, CAUSE: Short or Open Circuit. Intermittent.
2006 E350 w/ 155k miles (Daily Driver)

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!)
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