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Old 05-26-2002, 12:51 PM
Ivo Tyl
Posts: n/a
Question automatic climate control problem

Hi everybody,I just spent half of Sunday morning to read the Forum content re diesel,such a nice fraternity and thanks to many of you.
My 1981 300SD turbocharge suddenly changed into a moving sauna.The central dash vent spits out lot of hot air and when starting, I hear some clicks from the right side behind the gloves box .
My system was repaired just last September, it worked fine till last Thursday this week.
My mechanical skill is too low for opening the dash panels and checking if all flaps are free to move.My opinion is that sometimes even a MB dealer,where my last work was done,does not know all about this rather complicated system and design
I would appreciate an advice to instruct the repair shop where to look and what to do.Last time they just improvised for three days and for lot of my spare cash.

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Old 05-26-2002, 06:12 PM
Join Date: Nov 2001
Location: Cape Cod Massachusetts
Posts: 1,427
Lightbulb Monovalve? Maybe!

You can simply, easily, and cheaply diagnose and repair this type of problem. The symptom is continuous heat from the Climate Control System. The MB CD manual lists the fix as 83-625 in the ACC Manual if you own one. Better than that though, you can go here:

and look under Monovalve Replacement and follow the step by step! Good Luck!

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Old 05-26-2002, 08:54 PM
MVK MVK is offline
Registered User
Join Date: May 2002
Location: Queens, NY
Posts: 447
If all flaps work fine.....

If all flaps areworking fine under diff modes-- meaning defrost, front vent, leg room flpas etc. then its not the problem with any of the vacuum elements or the five change over switches.
Its then the monovalve. Its located on the fire wall in the engine comparment. Easy to test its function and repair is about 30-35 bucks kit and 30 minutes of time. Check the tripod member pages
Good luck.

Let us know what you find.
One penny saved is three penny earned.

1985 300D Turbo 179,000miles
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Old 05-28-2002, 01:27 PM
Ivo Tyl
Posts: n/a

Billybob and MVK,thanks for your info,I almost already started to look on eBay if somebody will exchange Yugo with manual heater control for my MB with that automatic climate intestine of tubes which a normal person avoids to touch.I will let you know what was the final result.Again many thanks.Ivo

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