jptobie

Climate control problems: having a problem were my climate control knob does not work all the time. For example, when I turn the knob form hot to cold, so I can use the AC, the temperature stays hot. Keeps blowing hot air out. It will at times change to cold air but only after starting, driving then turning it off. Very intermittent any suggestions on how to fix it would be appreciated

Shortbus

Here's a bulletin I found.
HVAC Controls Intermittently Inoperative or Improperly Responding (Reset HVAC Controller) #03-01-39-004 - (04/14/2003)
HVAC Controls Intermittently Inoperative or Improperly Responding (Reset HVAC Controller)
1997-2003 Chevrolet Corvette

Condition
Some customers may comment that the HVAC controller may have become intermittently inoperative or erratic in operation. In most all cases, the HVAC controller will function normally when the vehicle is examined by the technician. Additional comments may include a variance in the air temperature from driver to passenger side air vents.

Cause
The customer may be turning the temperature knob from warm to cool or from cool to warm very rapidly. Under certain conditions, if the temperature knob is rotated very quickly, it may exceed the ability of the HVAC controller to interpret the desired action.

Correction
Cycling the key to the off position will power off the HVAC controller and reset it, restoring normal function to the HVAC system on the next vehicle start. Instruct the customer that this is a normal function of the unit and that no repairs are necessary.

Warranty Information
You may want to provide the customer with a copy of this bulletin so that if the condition occurs in the future, the customer will not need to return to the dealership.