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Jeep Grand Cherokee Laredo
Jeep Wrangler Sport
Ford Ranger XLT

What could causing the heat gauge to be going up and down?

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Wiki User
October 13, 2008 9:23PM

It could be a lack of enough water in the radiator, or it might be a faulty thermostat. Your radiator might also be going bad. if there is no leak on your driveway, there still could be a problem. mine only leaked when the engine was running and the fan was blowing the coolant onto the block and evaporating it. Check both things out