I seem to be getting a oil smell out of the vents when the heater is on. Not diesel or coolant. The smell is gone when the ACC is on cooling mode. What should I look for?

Thanks,

__________________
Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section

I think perhaps you need to clean the engine compartment area. Oil and stuff can cause the smell under there. Clean it up, and you'll probably get rid of the smell
-Joe

__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

She is falling apart.
Call me when you get the B2 kit.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

Take a close look at your crankcase ventilation system and check for leaks there.
They best way I have found to do this is drive the car, get it good and hot, and then pop the hood and look for oil vapors coming out of/around tubes dealing with the crankcase vent stuff.

Mine used to leak, so I replaced it...problem solved

I thought it was already done...

__________________
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

Is it an oil smell or a antifreeze smell? when the car is cold smell the antifreeze fluid and compare. If it IS antifreeze your heater core may be leaking. If not then you may have tolook at the engine compartment.

Dave

__________________
1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

It has been done, I did it the day after it broke.




I will check the breather lines tonight when I get the car back, my father decided to take it to my brothers baseball game.

__________________
Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section