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Idahome
Joined: Wed May 2nd, 2018
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Sounds like your thermostat is full open by 210 and the water behind it is like 160-170 degrees so when that hits the sensor the temp dips?
Check coolant level make sure no air
Maybe time for a new radiator cap, as this controls the pressure in the cooling system and you have already done the thermostat.
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks