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I agree with Snowball, plus it could be a thermostat that is in the 165 to 180* range and it is going bad.
Keep watching the gauge, if it goes up and doesn't go back down, get it parked.
White 2002 Ranger XLT Extended Cab 4.0 4x4 4.10 LS
K&N CAI 77-2529KP
2 1/4" Exhaust
Explorer Dome Light
IN THE WORKS:
Sable Electric Fan
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