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ok -here what we need to do.Start your engine and ran it at fast idle (about 2000 rpm) When coolant temperature reaches 80-85 degrees C. check lower radiator hose . If hose stays cold -this is confirmation that thermostat is inoperative. Does your radiator fan ever kicks in? What gauge readings when engine is overheated? Coolant in your car is pretty much stand art. but it has one more valve-in coolant bypass hose,which is held by light spring, so at idle speed pump is not creating sufficient flow to open bypass valve. this could be your problem too. i'll send you schematic of your coolant system . And you don't have to accept my answer -you don't own me nothing until i'll help you solve your problem