1999 Geo Prizm Water Temperature Gauge Went Cooler While Driving On Freeway

1999 GEO PRIZM
200,000 MILES
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ANONYMOUS
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My water temperature gauge went cooler while I was driving on the freeway. It was cold outside and the heat coming out of the vents in the car got cooler. Is this the thermostat going bad?
Mar 19, 2013 at 7:21 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
It sounds like the thermostat is sticking open. That is the first thing I would check.
Mar 19, 2013 at 7:27 PM
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