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The only thing I know of that opens/closes the monovalve is the pushbutton control unit, because that's the brain of the climate control operation. Why don't you try taking OUT the mono valve and putting in small length of pipe or something, so that you know you have full flow of coolant all the time? If you DON'T lose the heat, then you know its not a vacuum problem, and something was shutting off the valve. If you STILL lose the heat, then you know the heater core is getting by-passed somehow.
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Streetside: 1987 Mercedes 300E Petrol Blue/Green
2014 Ford Mustang Grabber Blue
1999 Ford Ranger Green
Dockside: 1968 Eltro 17
1985 Silverton 34C
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