Could engine overheating be caused by low coolant?

Most common cause. Could be a leak, a bad cap, or simply not topped off.

Could engine overheating be caused by stuck thermostat?

A thermostat stuck closed prevents coolant from flowing to the radiator.

Could engine overheating be caused by failed radiator fan?

If the fan doesn't kick on at idle, the engine overheats in traffic.

Could engine overheating be caused by failed water pump?

Water pump leaks coolant and stops circulating it.

Could engine overheating be caused by clogged radiator?

Old radiators can clog internally, restricting flow.

Engine Overheating

Q: How serious is engine overheating?

Severity is rated Critical. Pull over and shut the engine off. Do NOT open the radiator cap when hot. After the engine cools, check coolant level and look for leaks.

Overheating can destroy your engine in minutes. Pull over immediately if the gauge enters the red zone.

Severity: Critical

What to Do Right Now

Pull over and shut the engine off. Do NOT open the radiator cap when hot. After the engine cools, check coolant level and look for leaks.

Common Causes

Low coolant: Most common cause. Could be a leak, a bad cap, or simply not topped off. Shop coolant
Stuck thermostat: A thermostat stuck closed prevents coolant from flowing to the radiator. Shop thermostat
Failed radiator fan: If the fan doesn't kick on at idle, the engine overheats in traffic. Shop radiator fan
Failed water pump: Water pump leaks coolant and stops circulating it. Shop water pump
Clogged radiator: Old radiators can clog internally, restricting flow. Shop radiator