03 Navigator Cold Weather Operation

UPDATE: Normally I start it up and get on highway to work so heat comes up almost normal but today just driving it around running the house running errands it stayed on the bottom peg so I stopped at NAPA and got a new thermostat and gasket. I don't do any work on my vehicles but my daughter was sleeping so that ruled out a shop so I did a search on internet and only found on thread on changing thermostats on the 32 valve 5.4L. I swapped the old one out with the new in about 20 minutes in my driveway (daughter sleeping inside) with the wind blowing and temp a steady 7F (with bare hands). It was a little tight for my big hands but I took my time didn't want to strip threads or lose bolts. Afterwards the temp gauge was at the bottom when started but I revved the engine at 2K until the coolant gauge rose up to dead middle which is slightly higher than it would ever get before. Back at idle it stayed there and only when I put the front and rear on high did it come down slightly but that was at idle. I put the front on med low and the rear on low and it got so hot I couldn't hold my hand at the front vent so I know there is a BIG difference. Tonight when I drive to work I hope to do a comparison to my normal routine. I want to thank each and everyone again. Throughout my 7 years owning TV's (had many different ones) you have all helped me with my problems and now that I am doing some work myself I hope to choke out my local stealership from lack of my funds LOL