Overheating IS300 - Lexus IS Forum
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post #1 of 2 (permalink) Old 12-12-2018, 04:22 PM Thread Starter
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Overheating IS300

just replaced thermostat in car and it overheated within minutes blowing coolant "smoke"into the cabin. The radiator is newer and the coolant is clean. Beforehand the car ran hot and the heat didn't work well, so we assumed it was the thermostat -the one we removed looked okay too and th spring worked fine-
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post #2 of 2 (permalink) Old 12-12-2018, 06:09 PM
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Originally Posted by NotmyIS300 View Post
just replaced thermostat in car and it overheated within minutes blowing coolant "smoke"into the cabin. The radiator is newer and the coolant is clean. Beforehand the car ran hot and the heat didn't work well, so we assumed it was the thermostat -the one we removed looked okay too and th spring worked fine-
Is the water pump circulating? Are the fans working?
The heat in the car. Has a different issue. The no heating in the cabin is an air mix servo problem.
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