If your OTR AC is struggling the circulating webasto coolant may indirectly in a small way effect that but not much. U need to have the OTR AC charged a little, possibly.
There is no webasto heat exchanger anywhere around your OTR AC evaporator. The fan for the dash evaporator when on does not pull air across that webasto exchanger up there either.
To your point u should absolutely close off the webasto valves if never in cold weather to keep unnessessary hot water flowing through the coach heat soaking it.
I'm not completely remembering the Liberty version other than 1 valve in perticular and I think it's the engine loop valve that Liberty does not ever set completely open. It would be 1 and 1/2 turns out from closed.
As u go and close them be conch 1 of those valves if in correct position u should discover in this position, only 1 and 1/2 turns open.
R u aware of the location of the cold air return filter for the otr ac evaporator and has it been cleaned lately?
Also just above the front bumper right in the middle if you reach in there with your hand you'll feel some grading and some screening. That's where you take in fresh air when you have the recirculating knob for the dash are set to the fresh air position instead of recirculate. It's been my experience that most of those blend doors that are supposed to be closed when you have it in recirculate seal very poorly and leak like a screen door on a submarine when they're in the closed position. Take some duct tape and tape off that intake above the front bumper and you might notice a little bit better performance out of the dash AC.
Hope this helps Jonathan and happy camping.
Once u do sort things out be sure to exercise the webasto from time to time or it's going to turn to stone.
Always entertaining to pull up old posts with Lewpops comments.
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