i recently took out my glove box and i saw a black hose about .25" diameter. it appears that a portion in the middle was removed, does it have anything to do with heating or air; the air is currently out of order. the hose appears to come from the firewall on the far right side and go to the middle of the dash where the vents and control unit is located, any thoughts? thanks bryan 1985 300d turbo

That is the air temperature sensor hose. In the middle of the dash is a vented square. This is the temperature sensor for the AC/Heat system. A foam tube should connect the sensor to the black tube you describe ( the foam tube is from the center of the dash to the hard tube). That black tube goes down to the evaporator case and allows the fan to such air over the temp sensor and into the fan housing.

Here is the post about the tube. The picture, scroll down for it, is the dash out fo the car and upside down.

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