This forum has helped me with Tach, AC, cruise, WVO, water leaks and vents. Now I have a question regarding a 1/2 inch rubber hose I found behind and above my glove box on my 85 300d. While fixing the center vents I noticed this hose in two piece. I am not sure what it is for and if I should try to connect them together. One piece is above the center vent area and the other about 4 inches to the right above the glove box. Any ideas?

Could it be the hose that goes from the dash intake for the temperature sensor to the blower? If it is, it needs to be repaired (looks odd, 4 i words in a row).

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html

if its made out of foam, then its your temp sensor it goes to the small box on the dashboard right above the glovebox.

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

It looks like foam around the ends on both pieces. The right piece appears to drop down the right kick panel area.

Sounds like your temperature sensor hose. It connects the blower motor intake (suction) to the temperature sensor located in the center of your dash. If the hose connecting the two pieces is gone, you can fix it fairly easily (and cheaply).

MB used a foam tube that disintegrated over the years. You can replace it with foam pipe insulation, a bunch of zip-ties to hold it into place on either end (TIGHTLY!), and duct-tape (if your pipe insulation is of the split-type) to ensure minimal air leaks. I did it for my 300D in the Home Depot parking lot, and it took me ten minutes.. works like a charm after that!

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(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]

Correct. This is a very common problem with ACC units, repairing/replacing the hose will make a difference in cooling/heating performance.

Alan

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DO IT RIGHT THE FIRST TIME, DON'T BE A HACK
Political Correctness is NOT part of my vocabulary
and finally FIGHT CRIME...SHOOT BACK

'82 240D Stick
'85 300D Auto
Drove my first MB at age 16 1960 300SL W190

Garden hose is a decent replacement.

Reason they used foam is because it doesnt retain heat and is a good insulator so the sensor could get an accurate reading.

__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

That's what I thought too, but the temp sensor is "upwind" of the hose, so I don't see how the hose can do anything other than pull air through the sensor on the dash.