Tn75da heater stuck on

[Cowfarm]

Replaced switch in cab 3 mo ago. Kids turned heater on a few mornings ago, now can稚 turn it off. I assume heater control valve is stuck open.?? Something else? Where is it located? Any one else have had this issue?

90 outside and hotter inside! Lol

 

[RickB]

Clamp a pair of needle nose vise grips or a hose clamp pliers on a heater hose somewhere near the engine. The heat control valve is cable controlled and at the side of the heater core in the cab ceiling.