Can some kind soul please post a real picture of the mono valve location for a 1991 300SL. I have a line drawing diagram on CD, but I can't pick out the valve in all the clutter. I suspect my valve is stuck open, as I get heated air in all modes except auto with the temp set low enough to activate the AC. However, with the AC on it gets plenty cold, so maybe the valve is OK. Anyhow, I'd like to have a picture so I know what I'm looking for. Thanks

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