Temp fluctuations in my 99 ford ranger 4.0, from normal running temp to high temp. But temp stays normal at idle.
1 Answer
Sergey answered 3 years ago
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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