gnathv
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this should be what the back of your controls look like
No. I have to switch off norm ac and back to keep heat out the vents.The default position if you lose vacuum is the defrost position. You say the air is strong out of the defrost. When the vents lose flow does the defrost seem to increase?
It almost seems you have 2 different problems.
1. The air flow is not directed by the switch.
2. The heat does not follow the air flow.
I think I would try to figure out the air flow first.