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C1Difficulty 3/5

Your lorry has a coolant expansion tank marked MIN and MAX. Under the manufacturer’s specified checking conditions, how should you check its level?

Correct answer

Check that it is between MIN and MAX.

Periodically check that the level is between MIN and MAX, following the manufacturer’s procedure. Do not fill the tank to overflowing or wait for an abnormal temperature rise before checking. Do not open a hot pressurised system: allow the engine to cool when required by the procedure. If topping up is needed, use the specified coolant and investigate leaks or repeated level drops.

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  • Check that the tank is overflowing.

  • Check it only when the engine becomes abnormally hot.

  • Check that it is between MIN and MAX.

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