2008 Ranger max heat - can't cool it down

[Dinkweed]

Hi everybody. Hope someone out there can help me with my heating problem in my '08 Ranger. It has a 3.0 engine and 5 spd manual trans. The heat comes out max hot and can't cool it down using the rotary temp control knob. It's comes out hot no matter the position of the rotary temp control. But at least I have heat, as it is winter up here in Canada!

Anybody have any ideas where I can start? I have an ODBC code reader. Does my Ranger have the plug in for that? Thanks for any help received.

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[Tbars4]

..I'm not 100% sure but do a search on here for "blend door" while you are waiting for other replies..