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Old 03-09-2003, 12:12 AM
Registered User
Join Date: Feb 2003
Location: Ohio
Posts: 66
Question 280 SEL (126.023) vacuum heater/ac problems

Need help with identifying vacuum distribution block located on passenger side panel near console. There is a manifold with six solenoids and vacuum hoses. Would like to know what each one operates. My heater starts to blow cold air while the heater is on once the car is moving, maybe a door/flap is not operating correctly. The manifold is labled 1-6 with color coded circles. #1 red and white, #2 red and yellow, #3 red and blue, #4 green, #5 red, #6 green and blue, also there are two plastic globes (maybe check valves?). Any help in troubleshooting this problem would be appreciated as a manual is not available.
Thanks in advance!
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Old 03-09-2003, 03:12 AM
jbaj007's Avatar
Registered User
Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
From the top (at least on my 300SD) Best I could figure from the car and the CD.
1. defrost flap valve
2. footwell flap
3. center flap
4. diverter flap
5. fresh air/recirculating flap
6. fresh air/in car flap

Test each with you MightyVac and you'll probably find a bad vacuum pod.
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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Old 03-10-2003, 02:50 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,115
If you have trouble maintaining cabin heat while moving or at high revs then check the monovalve if you have one thermostat control or the whatever the control valves are called on systems with left and right control valves. Maybe they're still called monovalves.

Do a search on monovalve and it should tell you what you need to know.

91 300SE
87 300SDL
83 300SD
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