The motor will not warm up on 2000 Ford Ranger

Motor will not warm up but it is still pushing a gallon of water in to the overflow bottle.We have changed the radiator cap and put fail safe thermastat in it and the took care of the problem for 2 months and now it is doing the same thing again any help would be great

by in Junction City, KS on May 06, 2009
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1 answer
ANSWER by , May 07, 2009
Sounds like the thermostat is stuck open, which is what these brand of thermostats will do if the engine temperature reaches a certain specification. I would get a thermostat from Ford and see if that fixes your problem.