1997 - 2003 Corvette: Service Bulletin: HVAC Controls Intermittently Inoperative or Improperly Responding (Reset HVAC Controller)

Subject: HVAC Controls Intermittently Inoperative or Improperly Responding (Reset HVAC Controller)
Source: Chevrolet Dealer Technical Service Bulletin
Number: #03-01-39-004 - (04/14/2003)
Models: 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:

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.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.