heater only works well at 90 otherwise it's only "warm" at bi-level output.
I had the radiator flushed yesterday. the outside temp indicates 187f & we know that ain't right. inside temp must be set at max for heat to exit floor ducks otherwise it blows coldvie this outlet How does the confort control system work anyway? AC however, will freeze you out! Is the comfort control sys dependent on the outside temp sensor?

 

I can't speak to the electronics of your system, but I can tell you that temperature problems like you describe are often a problem with the mix door. The climate control in cars is a matter of "mixing" hot air (from the heater core) and cold air (from the ac evaporator) to produce an infinitely variable outlet temperature all the way from full hot to full cold. If the door that controls this mixing (or the actuator that operates it) does not fully actuate to either the hot or cold end of the spectrum you can get the sort of condition you describe; it sounds as though the mixing door is not able to actuate to the full "hot" position, but is able to go the other end of the range of motion (full cold). The actuators and doors are in the ducting system inside the dashboard and are often vacuum actuated; can be lots of fun to work on.

 

Well, that's not user friendly info for the old man! Anyway, I have noticed that when set at 90 I will get heat fron the floor vents but I did notice that at other times it would go from hot to cold at the bi-level which would seem to indicate a bad mix door as you said. Does the outside temp have anything to do with the operation of the system as this reads a constant 187f ?