Thread: AC and Heat work on settings 1-4 but not 5?

Originally Posted by 02NavyBlue

Are you sure? ^ Usually it's the resistor if it blows on 5 only.

This.
Basically your Q is the opposite of anything ive ever encountered. However, dont rule out the resister and ign switch.
Any other funny things going on? Dic getting dim, clicking relays in dash, heated seats setting off relays?