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Neal, Mechanic
Category: Lexus
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Experience:  Shop owner experienced in most brands.
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Lexus IS300: I have a 2001 lexus is300 and when i drive it

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I have a 2001 lexus is300 and when i drive it for about 20 minutes and the engine warms up, the coolant goes into a reservoir tank and starts boiling, I changed out the thermostat, and changed out the coolant. I dont know why its doing it and i dont know if its safe to drive my car this way.

Hello I'm Neal and I am here to help resolve your issue. If I cannot help I will opt out and refer your question to another expert.


That is almost certainly just a bad radiator cap. Replace the cap and it should resolve the issue. Until then it should be ok as long as it does not run hot, but I would get a new one asap.

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