[W126 Coupe] Is this a monovalve problem?

[Vance Rowley]

Hi again Tom,

 Was nothing more than being told by a Greek MBZ tech after describing the symptoms to him. At the time I even asked him if it could be the monovalve which was the information I got from this list. His answer was that it could be a possibility if it had one, however according to him, the Euro version doesn't have a monovalve, it has a duo-valve and therefore was quicker and cheaper to just replace the auxillary water pump first. I was however having some major work done at the time (top end engine rebuild), so they just through in a new auxillary water pump for free. He was 100% correct (at least about the water pump) and it worked fine after replacement. Sorry I can't be more helpful.
Cheers,
Vance.
  ----- Original Message ----- 
  From: Tom Oelsner 
  To: Vance Rowley ; Mercedes Coupes Mailing Lists 
  Sent: Friday, December 08, 2006 4:24 AM
  Subject: RE: [W126 Coupe] Is this a monovalve problem?


  Hi Vance,
  How did you determine it was the auxiliary water pump?
    -----Original Message-----
    From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]On Behalf Of Vance Rowley
    Sent: Thursday, December 07, 2006 5:55 PM
    To: Mercedes Coupes Mailing Lists
    Subject: Re: [W126 Coupe] Is this a monovalve problem?


    Hi Tom,

      I had similar symptoms with my 91 Euro 560SEC some years back. The symptoms I had though would be more accurately described as blowing cold under acceleration, cool to warm under steady driving conditions and hot under deceleration and when stopped at idle. All this with the heater setting on full heat.
    To cut a long story short, it turned out to be the auxillary water pump.
    Hope this helps.

    Good luck,

    Vance
      ----- Original Message ----- 
      From: toelsner at comcast.net 
      To: mbcoupes at mbcoupes.com 
      Sent: Thursday, December 07, 2006 11:27 PM
      Subject: [W126 Coupe] Is this a monovalve problem?


      Happy Holidaze to Everbody,
      Well it is finally getting cold enough to turn on the heater in the mornings...now here is the scenario.
      When the car warmed up enough to turn on the heater, it was only blowing mildly cool air no matter what the temp setting or what buttons were pressed.  Driving speed was 75-85 (hey this is CA).  As soon as I stopped at a light, the air blew HOT.  The next day I tried a variation...drove the car until warm, pulled over and waited to see if it blew hot air.  Air only remained mildly cool.  As soon as I started driving, it blew hot.  I turned down the temp until it blew cold and then turned up the temp...only got mildly warm.  At the same stop light as the previous day, it blew hot.  560SEC has around 165k miles on it.  Does this sound like a monovalve problem?

      btw..saw a great license plate on a new MBZ when in LA earlier this week...hys2pid..maybe it was hys2upid...I was dodging traffic when I saw it

      Tom Oelsner


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