4104 dash heat and defroster

[dtcerrato]

Yes I usually do keep the rear (engine house)valves open unless it's excruciating hot outside then I close them so there is no heat transfer throughout the coach. The floor will eventually warm if there's heated coolant cycling the main heater core (under the floor) By the way there is a larger valve on the under floor heater core - that's the valve that if you close it - the defroster unit still has heated coolant flowing through it. The 4104 has great heating capacity even without the booster pump (as we don't have one of them)