circa 1990   same engine , replaced water pump 5 years ago.
gradually overheats on long drive
no coolant is missing
fan belt is quiet ... does not appear to be slipping
turning on interior heater with fan brings temp down
radiator is brand new ( 6 months )
( i have only seen water pumps fail by leaking and screeching )

What might it be ?   How can I test ?
99guspuppet



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