Hi, having the same problem first replaced the water pump then the thermostat was broken... right now the pressure in the coolant expansion tank rises when I'm going faster than 100km/h until there is no water left (after bleeding the system it's there again) in the tank.
The test for co2 was negative. Can it still be "just" a broken head gasket or is it more likely to be that the engine block or head is cracked? In my mind if the head gasket would be broken there would be traceable co2 gases in the cooling system.
Please tell me I'm wrong and I only need to replace the head gasket
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