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Is your heater hot water valve stuck open? If it is it would dilute your cool air. To tell see if both heater hoses are the same tempature at the heater core. One should be noticeably cooler than the other. If they are the same then see if the heater valve is closing all the way. If it is cable controlled and not shutting all the way the cable may require adjustment.
Mike
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Mike Keith
75 Argosy 26'
96 Ford F-250 PowerStroke
WBCCI 4503
Gr8r STL Unit
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