97 Town Car,No Heat

[Crazyhorse357]

Summer before last I bought an abused 96 Town Car with several problems none major, with one exception. The blend door actuator needed replacing, so I pulled the dash and replaced it cause I couldn't stand that tic, tic, tic, well that stopped the ticing, but it still will not switch to heat unless I set the temp comtrol on 90 and start pushing buttons, sometimes it won't take 5 minutes and sometimes 30 min and sometimes I just give up. If I back off the temp it will reach a certain point and switch right back to cold.
I don't hear the tic, tic of the blend door actuator, so what else could be keeping the heater from working? I have run the self test on the EVAC, no codes.
Any help will be greatly appreciated.
Many thanks,
Frank aka crazyhorse357

[jdl]

Does the engine reach normal operating temp? Are the heater hoses hot? Blower motor works? There are a couple of temp sensors, I could give you the resistance specs? I can't tell if the temp control door is operating like it should? Could be an issue with EATC module, whatever they call it?

[Crazyhorse357]

Emgine at normal operating temp, both heater hoses hot, blower motor works fne.
I have even flushed the heater core, radiator and every hose that pertains to the cooling/heating system. Is there any way, that you know of, to test the EATC module, I don't know if a new oe could be found and if I get one at the junk yard there's no guarantee it will work and they don't refund electrical parts. I could buy 10 before I found one that would work.

[jdl]

I know you said no codes, but, can you communicate with eatc?

[Blue)(Fusion]

What does the outside air temperature display? Is it accurate within a degree or two? My OAT sensor went bad on me last winter, reading 70+ when it was well below freezing. This caused the A/C to turn on when I had the system set for 72 degrees so heat only came on when I set it to 90F and operated the fan speed manually.