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A friend just bought a 38ft Holiday Rambler Diesel Endeavor, is on the raod and I don't have access to his manuals. It has a Cummins ISC 330 Engine in it. The problem is that it seems to put out vitually no heat in the cockpit area even though it's running at 180 degrees. I'm just wondering if maybe there's some sort of (summer/winter?) valve in the water line or maybe more serious like a blockage in the lines. Thanks for the time!