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This question is too vague.
Regardless, if you're asking about not getting AC when it is turned on and you know the AC unit is good - or not getting heat when you know that system is functional - then your likely talking about a "bypass" box (transfer box? I can't recall the real name) which has a big flap in it that turns one way for normal air flow and the other way for AC air flow.
Servicing this box requires removing the entire dash panel to get at it. Labor intensive and expensive at a dealership - less at your local trusted shop. Likely they'll need to replace that box (the flap is usually brocken and it appears they don't just replace the flap). This could run about $1200 at a dealership if my memory is correct.
However, you need to be sure this is the problem - a physical malfunction. Diagnosing the computer might be a first step - about $200 at the dealership, less (or free) at your local trusted shop.
Again - the question is very vague. Hope this helps
What else can I help you with?
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