I have a 2000 mercury mountaineer, the gauge is starting to go up and down and the truck isn't overheating.....what can be the problem.

Asked by Nov 08, 2015 at 04:20 PM about the 2000 Mercury Mountaineer 4 Dr STD AWD SUV

Question type: Maintenance & Repair

2 Answers

5,345

First thing to check is the coolant level. Then proceed to more complex issues after making sure your cooling system is at the right fluid level.

82,835

I would suspect your thermostat is going bad.

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