Proper way to bypass heater?

Idling hot?
hot below 30 mph?
or hot at freeway speeds?
With or without the A/C on?
Each of these is a different problem.
Im having issues with elec fan on/off settings. I have a Flex a lite fan with the radiator probe. Just can’t get the probe to work so I am installing a Dakota Digital control this weekend that taps into coolant sender. Crossing fingers that this will resolve the issue. You can bet I’ll start a new post if I can’t that to work, LOL! Just disappointed with the probe method but I think I was being overly optimistic thinking it would be a reliable method to activate fan.