Autopart International 1601-24121 Engine Coolant Thermostat

The Autopart International 1601-24121 is an engine coolant thermostat, sometimes called a cooling system thermostat. It sits in the engine's cooling circuit and controls how much coolant flows through the engine.

What it does:

• Stays closed while the engine warms up, so the engine reaches operating temperature faster
• Opens as the engine heats up, letting coolant flow to the radiator
• Helps hold a steady engine temperature

A thermostat that is working properly helps keep the engine from overheating or running too cool. It is a common replacement item in cooling system maintenance.