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Old 12-12-2009, 05:33 PM
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Join Date: Dec 2009
Posts: 1
85 300TD heater direction problem

The heat does not blow down to lower vents, they won"t open, I have jammed a wine cork in driver side for heat, help.......?
Just replaced the mono valve, what next/

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Old 01-06-2010, 11:22 AM
Renntag's Avatar
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Join Date: Jul 2008
Location: Kona, Hi
Posts: 1,396
I am no expert here....but from what I have read, this sounds like either a vacuum leak issue or a bad door actuator.

If you are able to find the door in question, or the vac line leading to it, apply vacuum and see if your issue is resolved. If so, you either have a leak, or an actuator that needs LOTS of vacuum.

I have read that replacing actuators may require dash removal.

I too am chasing NO HEAT gremlins. We have record low temps, and I have NO HEAT ! Ugh !

best of luck.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.
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Old 01-07-2010, 01:55 AM
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Join Date: Dec 2002
Location: Colleyville, Texas
Posts: 2,694
Vacuum element replacement does not require dash removal.

but you do have to determine if the element is the problem. You will need a mityvac and check the elements. As well as the control unit. I would start with the elements. They are usually the problem.
The mono valve was really a separate problem. That was the control of hot water flow to the heating system. The elements are control of the flow of air to the vents.

Do a search on "vacuum elements". Lots written on this

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
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Old 01-07-2010, 10:11 AM
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Join Date: Jan 2002
Posts: 18,356
Probably a bad vacuum pod. Do a search on my user name and footwell vacuum pod or vacuum actuator and you should find a thread I wrote about 6 years ago describing how to replace that actuator.

1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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