Great Britain Theory Test Coach
Vehicle safety and loadingQuestion 367 of 424

Your engine overheats. When can you remove the coolant filler cap?

  1. Straight away
  2. After the engine has cooled naturally
  3. After a short rest of one minute
  4. After you pour cold water on it
Show answer

Correct answer: After the engine has cooled naturally

Wait for the engine to cool before you remove the cap and add coolant.

Source: The Highway Code (Department for Transport, GOV.UK), Annex 6. Vehicle maintenance, safety and security, Vehicle maintenance

Practice vehicle safety and loading

Questions last reviewed: 18 October 2026