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Message: <blockquote data-quote="Mark Price 2" data-source="post: 996477" data-attributes="member: 70403"><p>JR- True. But, the role I believe of the HCV fully closed when a/c max and temp at full cool is so that there is no hot coolant flowing through the heater core. Thus making the cold air coming from the vents very cold. Much appreciated here in Texas. If there is hot coolant flowing through the core while you are trying to get the cab cold, it would take a bit longer as the hot heater core would make the cold air coming out a few degrees warmer. But, I could be wrong</p></blockquote><p></p>