no heat unless set to 90 degrees

by terry
(west newton pa)

95 corvette convertible . car has electronic climate control. after driving car for 10 minutes you will not get any heat unless set to 90 degrees. a/c works no problem blend door works, no codes showing in ac heater controller temp window. replaced temp sensors in side and out side of car, box under dash above steering column, and hvac controller in dash.

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