• Head gasket can leak in to the coolant without mixing with oil, so get a CO2 leak detector test and a good pressure test done, water pumps and radiators can get small leaks that blow off as steam rather than drip so look for stains of antifreeze around those areas, park over a blanket when hot and see if there are any stains in the morning, also check your carpet around the heater box inside in case there are any leaks in the heater matrix.

  • You can get some to hold a MOT co2 tester over the coolant screw tap ( can't think of the word)

    Cardboard under the engine bay is better than a blanket, as there is tell marks on the cardboard.

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