Engine Overheating

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— Greg Powell

What's going on

Overheating means heat isn't leaving the engine fast enough. Climbing Pikes Peak access roads, idling in summer traffic, or a small coolant leak can push temperature into the danger zone — where head gaskets and aluminum components fail quickly.

Symptoms

  • Temperature gauge in the red or warning light on
  • Steam from under the hood
  • Sweet coolant smell inside or outside the vehicle
  • Heater blows cold when the engine is hot
  • Coolant low on the overflow tank or under the vehicle

Can I keep driving when the engine is overheating?

No — if the gauge is hot or you see steam, pull over safely, shut off the engine, and do not open a hot radiator cap.

Driving even a few miles hot can warp heads or blow a gasket — turning the heater on full may help temporarily in a pinch, but stopping is the right call.

Once cooled, you may drive a very short distance only if a shop is immediately nearby and the gauge stays normal — otherwise tow.

Common causes

  • Coolant leak — hose, radiator, water pump, or heater core
  • Thermostat stuck closed
  • Failed radiator fan or fan clutch
  • Water pump impeller worn (common on higher-mileage vehicles)
  • Head gasket beginning to fail (white exhaust smoke, milky oil)

What happens next when you bring it in?

  1. 1 If you are stopped safely, call with what the gauge did and whether you see leaks.
  2. 2 We pressure-test the cooling system and check for combustion gases in the coolant when that fits the symptoms.
  3. 3 Before any major work, we explain what we found and what repair would involve.

Related problems

Unexpected repair?

Flexible financing is available through Wisetack and Synchrony Car Care™ to help spread the cost of qualifying repairs.

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