Temp fluctuations in my 99 ford ranger 4.0, from normal running temp to high temp. But temp stays normal at idle.

Asked by May 16, 2015 at 10:50 AM about the 1999 Ford Ranger

Question type: Maintenance & Repair

Replaced heater valve. And refilled the
system

1 Answer

125

Your problem probably is thermostat.In idle mode its make antifreeze run,when thermostat in a close position,on small circuit to heat engine faster,but when temperature of coolant reach preset level (each car have a different setting) thermostat will opens and let coolant run on full circuit what allow to cool your engine in full capacity.Try to replace thermostat.

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