1982 300D turbo, 200K+(?)

This is my first post as I am a new member but would like to thank everyone for such great info. I am new to Mercedes also, but have become a passionate admirere of these fine old ladies!

QUESTION... while chasing down some vacuum leaks, I removed my glove compartment and found two 1/2in hoses facing each other that ended in mid air with a 6 or 8 inch gap. They appeared to have been connected at one time and there was some rotted material all over the inside of the the under-dash area. One was attached to the temperature sensor under the dashboard, and the other looked like it was heading towards the blower but I couldn't be sure. Any ideas if this hose is important and what it did? Thanks




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1982 300D Turbo 123 Cream

Those hoses should have a pice of insulated tubing (pipe insulation works great) between them. They are for the climate control and the original stuff rotted away. The climate control may or may not work in your car but it won't work right for sure without those two hoses being connected.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k

Fermenteer,

The hoses should be connected together. The blower is supposed to pull air past the temperature sensor thru this hose so the sensor gets an accurate temperature reading.

Just patch them together with anything available.

P E H

Thanks for the ino... I will connect them tomorrow!. Is this the same insulation material that rotted away on the airconditioning hoses under the hood? I guess I should replace that too since that pipe is right up against the upper radiator hose.

Heres the link that shows what I did.

AC temp sensor FOAM tube??

Dave

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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

Much thanks.... now I will have to look for the AC foam tubes also!

I repaired mine with a length of PVC pipe and some electrical tape...it has worked like a champ ever since. Any idea why they used to foam in the manufacturing process?

Mike

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Mike

'80 300D
'84 300D
'85 300D
'87 300D

A piece of pipe insulation for 1/2 inch tubing works great.. Cost little.. Pick it up at a hardware store.. Will last longer than the original..

Ken

The factory used thick insulation because the under-dash temperatures can be VERY different from that in the cabin – if you use a piece of non-insulated tubing, the sensor will sometimes pick up the under-dash temperatures if the car is parked for a short time. This can lead to some pretty strange symptoms in extreme weather.

For example, when it is hot out and you use the AC for a good while, the temperature underneath / inside the dash can become pretty cold. Park the car for 5-10 minutes under these circumstances and the cool temperature will soak through a non-insulated tube and reach the sensor. When you go back to start the car, it will sense a very cold condition and blow hot air at you for a minute or two until the sensor warms back up. NOT a fun thing in 90-100 degree weather. Ask how I know this…

bump for new members. I found that using part # 6170160981 does the job. It's the part specifically used by MB. It's more expensive than some pipe insulation and duct tape ($15), but I found out from experience that it does the job best.
-Joe

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'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.