2005 Chevrolet Silverado SS Questions

Answered 2005 Chevrolet Silverado SS Questions

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Said now higher fan speed. Typed wrong no higher fan speed than low.
It's a 2005 Silverado SS ever since bought heat only works on 90 on climate control. Turn it to 89 cool air. And now the fan only works on lowest setting. Now higher. Any thoughts? Thanks.
I have a programmer pluged into the vehicle and it says No communication check key is on.The manufacturer of the programmer gave me a new unit and said to go to the Dealer (chevrolet) and have the computer set back to...