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Q:

overheating car on 1998 Honda Civic

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
why does my car overheat after replacing catalytic converter
(1) Answer
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I have seen the catalytic converters fail and the exhaust manifolds crack but the over heating issue is not due to having replaced the catalytic converter,
The most likely causes of over heating could be a coolant leak, a stuck closed thermostat, an electric fan not operating or a blown head gasket.