Why did all three blend door accuators suddenly stop working?

ID Status Date Year Make Model Transmission Type A/C Controls Public/Private
#13206 Closed 1999 Chevy Tahoe public

All three blend door accuators suddenly quit working. I replaced them but the heat still blows cold, stuck on defrost and the air circulation button makes a popping sound when engaged. I can manually change to heat or vent but as soon as I turn the car off it goes back to defrost and cold air. What is wrong with my Tahoe?

Sparky

Kind of hard to say at this point. Can you provide the part numbers and locations of the replaced actuators?

Do you have auto or manual controls?

New body or old body style Tahoe?

What do you mean by manually changing a door? 

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