[W126 Coupe] Is this a monovalve problem?

[toelsner at comcast.net]

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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