Running hot: likely causes and what to do
The most common reasons, how urgent each one is, and when to stop driving.
SAFETY FIRST
Pull over and turn the engine off. Never open the radiator cap when hot.
Likely causes
Low coolantMost likely
Stop drivingBad thermostat or fanMaybe
Fix soonWater pump problemLess likely
Fix soonWhat to do
- Notice when it happens (speed, braking, turning, cold or warm engine). It helps the mechanic.
- The most likely cause is low coolant: “Stop driving”.
- If anything feels unsafe, slow down, pull over somewhere safe and call for help.
- Check for open recalls with your VIN at nhtsa.gov/recalls. Recall repairs are free at the dealer.
General help, not a diagnosis. A mechanic can tell you for sure. Costs in the app are rough estimates.