[Bob Lincoln]

Stuck in defrost position means that there is a vacuum leak to the climate controls, either at the control unit itself, or a hose running through the firewall to it.

 

[geraldg]

I guess I didn't expain the problem correctly. It is digital and it lights up and the display shows defrost but you cannot change any of the settings including the blower speed.

 

[Oklahoma Wolf]

Button switches have probably gone flaky - do they work when you press real hard?