Could be air, low coolant level, faulty radiator cap, faulty temp sender, faulty guage, failing t-stat.
Do the simple stuff first, like checking the coolant level and the radiator cap/exp tank cap if so equipped, then on to the others.
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RRGrassi
70's Southern Pacific #5608 Fairmont A-4 MOW car
13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.
91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K
90 Dodge D250 5.9 Cummins/5 speed. 400K
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