1983 240D automatic. 208k miles. Getting everything working to put it on the road for the first time since 1998. Drivetrain is good.

The green vacuum line going into the passenger compartment is apparently related to the climate control system.
When I disconnected and plugged off the vac line, my auto trans started shifting nicely! But now I want to make the climate control work.

While I scour this and other sites for info, maybe somebody can offer suggestions as to where to look first?

I have the center console apart at the moment and the lower panels off. I see a loop of the green vac line to the right of the steering column, but I can't tell where it goes from there.

So far I've not found docs on debugging this.

Thanks in advance for help.

I didnt know ANYTHING climate control wise was vacuum related on the 240...

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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
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

By "Climate Control" you mean ac? It should have a manual dial to rotate for the ac, if it doesn't engage the ac clutch I am guessing there is propably no refrigerant after sitting that long. The green vac line is likely related to the door lock system which if leaky negatively affects the tranny shifting as you found out.

I posted this in your other thread about the same subject.
http://www.peachparts.com/shopforum/diesel-discussion/380154-tracking-vac-leak-green-line-climate-240d.html

There is a air recircualtion flap that is controlled by vacuum on a 240D. I believe the green line goes to an electrical switch overvalve and then leads to the vacuum pod.
It's all behind the glove compartment box and remove the dashboard knee panel to see the line.

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1983 123.133 California
- GreaseCar Veg System

Green with yellow stripe tube is for the climate control. Door locks are yellow/red and yellow/green

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"

Correct the 240D just has a single valve and pod for recirculation. The valve is activated by turning the temperature wheel to Max. It is fed by the green hose from the brake booster line tap.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech