If it has plenty of coolant, then a low fluid level condition shouldn't
happen......the 'fluid' is the coolant. Be sure the coolant recovery
tank is filled to the Max indicator when the engine is cool. Keeping
the coolant recovery tank properly filled should purge any air in the
cooling system. If that isn't the problem then it's probably in the
controls. There may be a water heater valve malfunctioning or the temp
blend door malfunctioning.
Hope this is of some use to the problem.....
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