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  #31  
Old 06-12-2008, 11:01 PM
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Location: DFW area (north side)
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I wonder if the failure is due to my choice of coolant. I've always used Zerex and only recently learned reading this forum that the preference is a red MB coolant. Is that a dealer only item?

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html
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  #32  
Old 06-12-2008, 11:35 PM
Craig
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Actually, the correct coolant is the amber MB stuff, which is the same as Zerex G-05.
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  #33  
Old 06-12-2008, 11:39 PM
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Thanks,
I've learned more about my car in the last four months on this forum than I did in the 25 years of ownership.
I'll have to look at my Zerex bottle to see it's the right type. I know is was listed for aluminum.
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1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386
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  #34  
Old 06-13-2008, 11:58 AM
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Quote:
Originally Posted by Craig View Post
I've never tried to take the check valve apart either, but I believe it's only function in to prevent back-flow into the heater core when the monovalve is de-energized with the car shut off. When the engine is running, the water pump should not allow back-flow anyway.
The reason I'm a little suspicious is for a couple of reasons. The a/c, on occasion, is only moderately cool and in the winter I can hear the heater core filling with water when heat is turned on. With mention of this check valve, I wonder if the two are related?
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84 300SD 350K+ miles ( Blue Belle )
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  #35  
Old 06-13-2008, 12:10 PM
Craig
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Quote:
Originally Posted by SD Blue View Post
The reason I'm a little suspicious is for a couple of reasons. The a/c, on occasion, is only moderately cool and in the winter I can hear the heater core filling with water when heat is turned on. With mention of this check valve, I wonder if the two are related?
That is strange, but I don't see how the check valve would be the cause. Also, I never hear my heater core; I wonder if you have air in the system someplace. If the AC system is working (compressor is engaged, top AC hose is cold), I would still suspect that the monovalve is letting hot water into the heater core under some conditions.
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  #36  
Old 06-13-2008, 01:35 PM
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Quote:
Originally Posted by Cr from Texas View Post
I'll have to look at my Zerex bottle to see it's the right type.
Zerex, much to their credit, makes several different types of coolant.

Quote:
Originally Posted by Cr from Texas View Post
I know is was listed for aluminum.
Aren't they all???

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