Re: 1993 coolant temp ?
It's still up in the range, so you shouldn't have too much problems with keeping the interior at a reasonable temp. I wish Ford would number their gauges! I'm sure if you drove in traffic for a bit the needle will move back up to the RM area. Most vehicles, if the engine doesn't warm up to a certain temp in a certain period of time the engine can throw a code. Generally you'll get that if you decide to throw in a 160F stat, which is WAY too cool for street driving unless you like to keep the rpms near redline on a regular basis....
Still, I was surprised, but not shocked that the needle on my '99 Taurus would stay in the middle of the gauge around town, and cool down slightly on the highway, unlike with the OE stat, the gauge wouldn't budge, no matter if I drove in town or on the highway. At least I know it works!
I couldn't run a 180F stat below freezing, it's just warm enough to keep the front windows clear, but I couldn't get the interior above more than 10C, or around 45F. On colder days, except just above freezing inside - which was still better than the -44C outside!
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!