Yes, I agree it can be confusing & now I'm confused.
Quoted from the repair manual...
"valve may stick in either the "heat on" or "heat off" position.
"If it sticks in the "heat on" position,
it will result in poor engine performance, overheating and detonation."
"On the other hand, if it should stick in the "heat off" position,
the heat will be turned off the intake heat riser at all times and result in poor performance,
particularly while the engine is warming up and driving at lower speeds."
To me, "heat off"(as quoted from the manual) is the same as removing the flapper completely.
And If you remove the flapper, the flow is now open and the hot gases go out the tail pipe.
Am I understanding this correctly?????
