I know this is a common issue, heater not working, but I cannot find a thread that relates to my issue. The temp **** is causing the blend doors to move, I actually took the blend door motor off and manually moved the metal connector between the two doors and I can hear and feel them opening and closing, Im pretty sure both are still attached. When I switch the temp to cold it gets cold, when I switch to hot it get room temp. Both of the hoses coming into cab get hot, truck gets to operating temp with no problem, the recirculate door operates properly it just doesn't get warm in the cab. Can anyone shine some light on this for me?

 

when was the last time the system was back flushed? you may have some blockage in the system.

 

Check coolant level. Ditto on the flush.