96 s-10 blend door actuator

I just ordered a blend door actuator and it doesn't have all of the pins the one i pulled from the car does. There is two choices on the website and one says w HD heater. what exactly is an hd heater?

That is one of the times your local GM parts dealer can be your best friend.
Have him run your vin no or RPO code to get the right one.
MT