[W126 Coupe] Is this a monovalve problem?

[Tom Oelsner]

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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