5KSQ Climate Control System Question

[Christopher Ritchie]

With the Climate Control in "Economy" and set at 68 degrees F, the heat in 
the winter blows out on the floor, as it should.  But sometimes after 
driving a while, it will suddenly:

1. switch to the mid-level dash vents;
2. increase fan speed; and,
3. blow much hotter air.

There is no blinking red light on the CC.

Is this a common problem?
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