Heater will not stay working

by Paul
(Black River Falls, WI)

I have a 1984 Corvette which will not always blow hot air. Generally, after the car starts from cold, the coolant heats to about 194 degrees, and if the heater is on, the heater seams to work fine and blows very warm air. However, if you slide the control lever to colder positions, especially all the way to cold, if you move the lever back to the hot position, it blows cold air, even though it was working properly before moving the lever to cold. If the control rod were disconnected from the actuator (heat lever or door) why would it work again when started from cold?

Any Help?

Thanks.

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