Could well be a stuck open thermostat... I had that problem on an Escort I own last year and I thought it was a little odd. Then I got to winter... and the lack of heat in the car became an issue pretty rapidly once the white stuff began to accumulate!
Check the therm... even if it looks closed it might not be (my Escort's looked closed even when I pulled it out... but replacing it did the trick).
More likely to be the therm than the guage or any of the related hardware.
Hope this helps!
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