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Old 01-16-2003, 09:02 PM
my300d's Avatar
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Join Date: Dec 2002
Posts: 11
Unhappy no heat to floor

My 1983 300d does not put any heat down to the floor. It does not seem to matter what position the selector is in the heat comes out the side vents and the defroster. If Imanually reach in back of the heater and open the door heat then goes to the floor!Any ideas?
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Old 01-16-2003, 09:24 PM
pesuazo's Avatar
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Join Date: Oct 2002
Location: Near Raleigh, NC
Posts: 580
How did you reach it?
1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
609 Certified
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Old 01-16-2003, 10:57 PM
fz500sel's Avatar
Happy now in paradise!
Join Date: Nov 1999
Location: Venice, FL - "sharktooth capital of the world"
Posts: 712
Sounds like a vacuum problem to me.

Do you get any vacuum to the diaphragm/actuator that is supposed to open that flap?

Kent Bergsma at **************.com has a great vacuum troubleshooting manual for DIY'ers. It explains in laymans terms how everything works and steps you thru how to troubleshoot the problem. The manual is only $20 and I feel is well worth the investment when you own a 300D.

Good luck,
85 300D 310K (sold)
90 350SDL 184K sold
83 300D 118K (sold)
88 300E 153k (sold)
93 400E 105K (sold)
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Old 01-16-2003, 11:29 PM
JFAZ's Avatar
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Join Date: Mar 2002
Location: Sacramento, CA
Posts: 90
Check out my post here:

floor vents not functioning/opening, HVAC 86' 300E W124

Good Luck - Don't give up!

05 E55
03 E500
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