mine was the heater control valve. Its up on the firewall behind the battery. I took the cover off, and spun the valve back and forth a few times and it cleared up.
I never did replace the incorrect valve i used to replace the broken valve.
Have not noticed any down sides to just manually opening it.
So save yourself $100, put the cap back on it, with turned open, and throw away that 'double geared plastic piece of junk stick' -- or it will forever remind you that your truck isn't 100%.
My '07 is doing the same thing. No heat. If I turn the heat all the way to cold, leave it a second, then turn all the way to hot, it SOMETIMES results in heat.
My questions:
-What does the shaft connected to the gears do?
-If I remove the shaft, can I still have control of the heat/AC from the cab?
Dustinm, I have the same issue exactly! I replaced the heater control valve and still have the problem! The valve is not opening, the hose is hot on one side of the valve but not the other, I checked to see if there is power getting to it and there is not. Any suggestions??
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