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Either the cap is defective or too much pressure is building up in the system. I would replace the cap is it does not appear to be overheating. answer you have a defective radiator cap replace with a new one with same pressure rating as old one

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โˆ™ 2007-02-15 17:40:34
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Q: Why would your car smoke from the radiator cap if the cap is on all the way?
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