I'm concerned about my 1990 Loyale (155k miles, 4wd, standars trans)
The temperature guage is allways cold. The needle climbs just a tiny bit after running it hard but it never really gets off the bottom. I suspected the thermastat so I looked into it. Pulled the old t-stat out in the morning when the engine was cold. I suspected t-stat to be stuck open but no, it was shut. I had a new one (180 deg) so I replaced it anyway. Drove the car this morning and same situation on the temp gauge - cold.
I assumed that if the gauge wasn't working the needle wouldn't move at all. It moves just a hair and drops when I shut off the engine.
Should I be concerned about running the engine too cool? Could it be a bad sensor and maybe I wouldn't even know if it was overheating? If so, how can I check the temp sensor and gauge?