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The AC of my 02 mercury mountaineer started malfunction from last winter, first it was blowing cold air in winter then warm/hot air in summer. I gather that's basically ambient air that haven't pass through either compressor or heat core, and the blend door is most likely at fault.
I have a 2003 Limited with dual zone electronic climate control.
For a couple years now, in the winter, this has been happening: The truck has been driven and is warm, blowing hot air. It is then parked until it is cold-soaked (i.e. overnight). When the truck is started, the heating system...