Dash AC blows out of the defrost vents
the dash AC blows out of the defrost vents when engine is under a strain, such as climbing up a hill, etc. my motor home is a 2000 itasca suncruiser. the engine is a ford v10 i feel it is a vacuum...
Forum Discussion
wolfe10 wrote:
Doug,
Have you experimented with a vacuum reservoir along with check valve to maintain adequate vacuum to the HVAC system under high throttle/low vacuum situations?
Yes. I have experimented with dozens of attempted fixes over the years, including dealing with the OEM motorhome makers and Evans/tempcon. NOTHING works. The only thing that works and is consistent is adding a 12 volt electric vacuum pump. My statement about inherent vacuum leaks came from the makers of the Dash AC evap systems. I have replaced various vacuum motors and dash switches per the OEM's instructions and none fixed the vacuum leak problem. When the engine goes to zero vacuum, it does NOT pull Vacuum from the reservoir ball. The system just uses up what little vacuum it has. Doug
