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Thermostat is bonkers ... (it's attached to the engine) ... need new one.

Unless the engine is particularly under severe load or doing an inordinate amount of climbing with a heavy load, the temperature should stay fairly steady at all times. Abnormal temps like this are symptoms of improper water flow into and out of the engine block.

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Q: Heater not putting out hot air when the temp switch is adjusted to hotter temp engine temp goes up and down.?
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