A bad catalytic converter can make a car overheat by causing a backup of pressure in the cylinder head. Pull over and shut a vehicle down if it overheats with tips from a certified master mechanic in this free video on car maintenance. Expert: Thomas Brintzenhofe Bio: Thomas Brintzenhofe has been a certified mechanic for the past 14 years, and a certified master mechanic for the past eight years. Filmmaker: Reel Media LLC
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