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...
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You have diagnosed it correctly.....mostly.
Mine did that occasionally just because of a lack of vacuum when pulling hard without downshifting. It got much WORSE when I loaded a "custom tune" because it tended to stay in the top gear longer.
There might be a vacuum leak but it might just be "normal" too.
Adding a larger vacuum tank or an aux. vacuum pump can completely fix the problem.
Not using the cruise control in hilly conditons can help too.
P.S. ALL of the RV shops I went to just came up with a blank stare.
I finally found a truck shop that knew what they were doing.
Mine did that occasionally just because of a lack of vacuum when pulling hard without downshifting. It got much WORSE when I loaded a "custom tune" because it tended to stay in the top gear longer.
There might be a vacuum leak but it might just be "normal" too.
Adding a larger vacuum tank or an aux. vacuum pump can completely fix the problem.
Not using the cruise control in hilly conditons can help too.
P.S. ALL of the RV shops I went to just came up with a blank stare.
I finally found a truck shop that knew what they were doing.
