* Restricted Exhaust Flow: A clogged or damaged catalytic converter restricts the exhaust flow. This increased back pressure forces the engine to work harder, generating more heat. This extra heat can stress the cooling system, potentially leading to overheating, especially during prolonged periods of high engine load.
* Increased Engine Temperature: The increased back pressure and harder work from the engine directly lead to a higher engine operating temperature. While not directly "running hot" in the sense of coolant overheating, it puts more strain on the cooling system, increasing the risk of overheating.
It's important to note: While a failing catalytic converter *contributes* to higher engine temperatures and *increases the risk* of overheating, it's usually not the *sole* cause. If your car is overheating, you should investigate other potential causes, such as issues with the cooling system (radiator, water pump, thermostat, coolant levels, etc.), before focusing solely on the catalytic converter.
