My 2002 chevy Tahoe only blows on defrost when I turn on the air or the heat. What can I do?

ID Status Date Year Make Model Transmission Type A/C Controls Public/Private
#15358 Closed 2002 Chevy Tahoe public

2002 Chevy tahoe

Sparky

More than likely the mode actuator has failed and will need to be replaced.  A compatible scan tool would be very useful in diagnosing the problem  but I don’t know if you have access to one or not.  Also you might want to perform a recalibration especially if battery power was recently lost.

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