PeachParts Mercedes-Benz Forum - Replacement monovalve heat control

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Quote:

Originally Posted by pawoSD (Post 1691133)

The aux pump is a super pain to get to since its buried under all those hoses behind the bulkhead, but I may give it a try if replacing the engine thermostat doesn't help anything. (I only get to 65-75C most of the time, and it takes a while) I know it has been ailing a long time and probably died, it used to make bad sounds when I was starting the car in the morning, and now it is silent. I have a replacement in my spare parts in excellent/almost new condition that I can put in, but that will be an afternoon project....maybe next weekend I will look into it, if replacing my thermostat Wednesday doesn't help. It probably is the aux pump....:rolleyes: However, I have it fused at the plug (that red wire thing in the pics) and it hasn't blown the fuse :confused: So I have no clue....if it was dead you would think it'd blow the fuse. Its only a 1A quick-blow fuse.

Your Auxillary pump is buried back there? Mine is on the fender well underneath the air filter where it can be easily reached. I've never seen a Aux pump placed there before. Did you relocate it for some reason?

Quote:

Originally Posted by Knightrider966 (Post 1691371)

He's got a W-126. Relocation courtesy of Mercedes-Benz.:mad:

Quote:

Originally Posted by pawoSD (Post 1691133)

The aux pump is a super pain to get to since its buried under all those hoses behind the bulkhead, but I may give it a try if replacing the engine thermostat doesn't help anything.

Do yourself a huge favor and remove the battery and the removable section of the forward firewall. Makes the job 1/10 as difficult.;)

Quote:

Originally Posted by Brian Carlton (Post 1691388)

He's got a W-126. Relocation courtesy of Mercedes-Benz.:mad:

Oh! I thought he was working on a 300 D!:headshot:

yeah, I wish it was in the same place as on a 300D....oh well.

I will at least remove the battery, not sure if I want to un-do the false bukhead though, I'll decide when I am actually working on it, but I will probably unbolt and move it over a little.

I still don't get why it did not blow my 1A fuse I put in there. Kinda odd. It needs to be replaced either way, as it made bad sounds for a long time....

And speaking of monovalves, check out this W126 EURO monovalve....must only be on certain cars, the one I pulled from a euro 500sel in the u-pick was identical to the US version. From the looks of it I am thinking its a "dual" monovalve for independent driver/passenger heat selections. Pretty nifty, and probably SUPER expensive to replace. :eek:

Pic:

http://i1.ebayimg.com/07/i/000/c8/cd/2997_1.JPG

One thing I need to do and everyone should be aware of if your going with a monovalve replacement like my setup. Install a one way vacuum valve in the line so vacuum cannot reverse when you shut the engine off!:eek:

If you don't, your engine will not shut down like it's supposed to if you just shut down the climate control and turn the motor off at the same time!:mad:

The vacuum from the heater valve will return into the line to the vacuum pump and accessories and neutralise the shut down procedure!:headshot:

If you shut off the climate control and wait a few seconds before turning the motor off, no problem!;)