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Old 12-05-2009, 08:27 AM
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Join Date: Dec 2009
Location: central, PA
Posts: 255
W124 1991 300D Mono Valve - Repairable ?

I suspect my heater valve ( mono valve ) is at fault as I have had intermittent heat some time remedied only by restarting the car and by keeping temp Wheel on high or highest setting

Though there is a great deal of discussion in various threads regarding the repair 'kit" for the mono valve I have not been able to find any supplier that provides a listing that matches my application 1991 300D 2.5 Turbo Diesel. Is this in fact a unit that the marketplace provides a kit for or should I change the whole unit - Thankyou

Last edited by Chris_; 12-05-2009 at 10:41 AM. Reason: to clarify
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Old 12-05-2009, 01:41 PM
Jeremy5848's Avatar
Registered Biodiesel User
Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
I have always been told that the W124 chassis monovalve is not repairable. All you can do is get a used one from a junkyard or a new one from Phil.

"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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Old 12-06-2009, 03:57 AM
compress ignite's Avatar
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Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
Jeremy's right

Used (But, not abused) or Brand Spanking New from Bosch/Mercedes.

'84 300SD sold
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