why does my car overheat after replacing catalytic converter
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1998 Honda Civic Question: overheating car
Answer #1patrick mannion from Greg Solow's Engine Room, February 09, 2010, 17:20Master
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.