Cooling water loss and negative pressure

Chevrolet Rezzo 2008

I bought Steel Seal because our car was leaking cooling water and there was also a vacuum, about half a liter of water per day. I did everything according to the instructions, even flushed the cooling circuit with 30 liters of water, and then filled a bottle of Steel Seal into the expansion tank with new water. Then let the engine warm up and again 30 minutes after reaching operating temperature. Then left to cool down overnight. The next morning, no water loss and no more vacuum. Engine runs smoothly again. Can really only recommend Steel Seal. Thanks for the super product!

Torsten Franke
01.12.2022, 17367 Eggesin

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