Originally Posted by Toreador4x4
do as stated above, and also record the temperature of the heater hoses before and after the heater control valve
I replaced the heater control valve last year. Could it be out again?
I cut a hole in the side of the box behind the glove box to see if the blender door was functioning.
It is opening and closing as I assume it should. There is hot are blowing when it is closed, but then it turns cold.
It feels like the AC is not turning off and the heat and air are battling each other. ( or could this be from the air pocket thing ?)
The AC is supposed to turn off isn't it, not just be blocked by the blender door?
The fan was pushing hot air for 5 or 10 minutes sitting still, but when I started driving it would alternate hot and then cool down significantly.