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  #16  
Old 01-11-2011, 02:22 AM
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Location: Oakland, CA
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While you are in there, unplug the aux pump

As has been stated, the aux pump (which is generally useless) is not separately fused, unless you consider your pushbutton unit's circuit board to be a large fuse. And that's what it will become when the pump goes. Best thing you can do for it is to unplug the pump.
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Current:
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  #17  
Old 01-11-2011, 02:40 AM
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Join Date: Aug 2005
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Quote:
Originally Posted by AlanTbird View Post
jeepers, if mine was that easy to access i would pull it out and put in a brass ball valve
summer off and winter on! win win
and then you'd have no control over the temperature in the cabin but you'd have a nice el cheapo repair.
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  #18  
Old 01-11-2011, 02:37 PM
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Having intermitent heat issues with our W123. I have had the MV apart and it looks ok if memory serves. I will check it again. This is an expensive little bugger.
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  #19  
Old 01-11-2011, 10:37 PM
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Join Date: Aug 2008
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I just replaced my monovalve. The results have been amazing. Took less than five minutes.
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  #20  
Old 02-12-2018, 01:21 PM
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Join Date: Jan 2015
Posts: 261
Old thread, I'm dealing with this now.

I replaced my monovalve about a year ago with an MTC unit. The original was toasted.

Now I've got heat only, with cooler air at speeds. I did notice coolant leaking from the bottom of where the valve would sit. Now I'm thinking I may need an entire new assembly.

Will also look more into the aux pump as well.
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  #21  
Old 02-12-2018, 05:54 PM
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Location: Texas Hill Country
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The MTC unit is a known bad part. Unfortunately the OEM cartridge shot up in cost about a month ago, so have deep pockets. Don't waste your money on the MTC unit, it will only bring you tears (and a cold car)
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  #22  
Old 02-12-2018, 06:41 PM
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Join Date: Sep 2006
Location: Middle TN
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Scavenge as many as you find in the yards. They are almost free there because the yard people don't know what they are. I'll get the whole thing next time because my spare body is MIA.

You may have to pull up on the center to see the tear in the diaphragm if you don't know what you're looking for.
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  #23  
Old 02-12-2018, 08:08 PM
Shadetree
 
Join Date: Jan 2010
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I have a spare and I'm keeping it close.
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  #24  
Old 02-12-2018, 10:57 PM
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Posts: 156
This morning I replaced a 1year old MTC with a new Mercedes part. Problem solved.
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  #25  
Old 02-13-2018, 01:13 PM
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Join Date: Nov 2014
Location: Olympia, WA
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I have also been through the mono valve drill. Two things:

1. Replace with Mercedes. The Mtc does not work, and the common symptom is no heat at engine speed much over idle.

2. Be very gentle unplugging the wire to the solenoid. The pins broke on mine, and I had a hard time finding a plug or solenoid without broken pins. In fact, my woes started with broken connector pins. While dealing with that, I decided to throw in the new mono valve I had (MTC). I finally got a working solenoid from a parts yard with the wires cut so the plug does not have to be unplugged.

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  #26  
Old 02-13-2018, 01:51 PM
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Location: Denver, CO
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The inserts are now available from Mercedes. The aftermarket brands usually don't work very well - at least in my experience.
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  #27  
Old 02-13-2018, 11:18 PM
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Posts: 261
I said **** it, bought this: Klima Design Works | Monovalve and Coolant Circulator Pump Eliminator / Upgrade Kit

We'll see how it does.
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  #28  
Old 02-14-2018, 09:32 AM
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Quote:
Originally Posted by MongooseGA View Post
That is pretty cool. I wonder how that would work for the Klima II ?(EVIL Servo)
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  #29  
Old 02-14-2018, 06:58 PM
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Hopefully it works well. I've seen people saying they can source everything in the kit for cheaper but for the time I'd spend, $100 seems like a pretty nice deal for everything it claims to do and the parts I won't have to replace now.
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