Does anyone know what climate control vacuum cross-over valves #1,2 and 3 do? I have leaks in all of these and I've gotta dive in and replace whatever diaphragms these valves are for. Oh yeah, its on an 83 300sd.

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"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

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Mb doesn't label them 1,2,3, etc; but, rather, from top to bottom 15, 14, 13, 18, 17, 16. ( I know... why? )

15. defrost
14. leg room flap
13. center nozzle flap
18. scoop air flap
17. fresh air/recirculate/main (large stroke)
16. fresh/ recirculate/ main (small stroke)

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

I presume that you are referring to the "switchover valves" that live in a row next to the radio and climate control.

#1 is on the bottom. It controls the fresh air/recirc air flap. It's a dual diaphragm pod accessed by removing the glove box.

#2 is above #1. It also controls the fresh air/recirc air flap. It's also a dual dipahragm pod accessed by removing the glove box.

#3 is above #2. It controls the scoop pod. It's a single diaphragm pod that you can rebuild with a $5.00 rubber diaphragm. AFAIK, it's located right above the driver's right foot.

Do yourself a favor if you've got the system open. Connect the supply vacuum permanently to the output of #4 and bypass #4 completely. You'll get the center vents working 100% of the time in all seasons and you can regulate them with the dash sliders.

Awesome, thanks a lot.

__________________
"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

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