It is good to know. But it only helps, if you use the Auto feature, which not many people take advantage of. Not sure why as it's one of the best features on the car.
Every pic of a MN12 interior I have seen has the temp set on 90 and fan on manual like they are trying to trick the system into pumping out more heat.
Just set the temp like you would set your house t-stat, and it will lock in! It wont blow any cold air, just heat once the coolant temp warms a little.
My old T-Bird has it, but my new one doesn't. It's a PITA to constantly adjust the temp dial. Why anyone would want to do that when they don't have to? \rant off.
97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles