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Old 06-05-2008, 09:31 AM
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Join Date: Aug 2006
Posts: 185
1985 300sd Air Condition Vent Question

All of the air is coming out of defrost. Is there a simple way to repair this or manually open to get air out of vents? Thanks in advance Jack

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Old 06-05-2008, 09:39 AM
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Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,377
simple? ... dig into the dash and wire it open?
the 85 is fun to work on... you could try a ccu resolder...
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
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Old 06-05-2008, 10:19 AM
I'm thinkin, I'm thinkin.
Join Date: Jul 2003
Location: Arlington, Texas
Posts: 440
Don't know how much different the 85 is from my 83 but a thing or two I found while trying to diag that same situation with minelast year. The diaphragm above & to the right of the accelerator works the flap that sends air to the vents. During my testing with a hand held vacuum pump on that diaphragm, I was able to keep it open by pulling vacuum and plugging the line to hold the vacuum. My problem ultimately turned out to be electrical - the switch-over valves on the right side of the console.
Sharing my partner's 2012 Forte 5dr SX til I find my next 123 or 126..
Do I miss being a service advisor ???
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Old 06-05-2008, 10:35 AM
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Join Date: Nov 2004
Location: North central Texas
Posts: 2,588
Look at the switchover valves just to the right of the radio.
You may be able to manually steer the air by re-routing vacuum from there.

Get a "Mighty vac" and check the valves, pods for leaks and fix it properly.

I just had to repair this same issue on my 85 SD. Turned out to be two bad switchover valves. One had an open coil, one leaked. Easy fix when you understand the system.

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