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New thermostat fitted radiator cap had tested for blown gasket sees ok. Radiator looks very clean inside. Runs fine for plus munis 40 km [hard driving) and suddenly overheats pushing water into resvoir.without thermostat can see water flow but does the same.

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The radiator sheds heat at a specific rate. Increasing air flow increases that rate a bit, but even with increased air flow, there is a specific rate.

When you start out, there is a "cold reservoir" in the radiator — without shedding any heat at all, for a while the cold water in the radiator will keep the engine cool.

If the heat from the engine exceeds the heat the radiator can shed, as soon as the radiator water hits the temperature of the engine, you will have overheating.

If you have a head gasket leak, you are injecting heat directly into the water, heat that ought to go out the tailpipe.

If some of the tubes in the core of the radiator are not flowing, the ability of the radiator to shed heat will be diminished.

I am thinking it is either a head gasket leak/cracked combustion chamber, or a radiator that does not flow water through all the tubes.

A lean fuel mixture will generate a lot more heat than one that is richer. The coloration of the spark plug insulators can be helpful in assessing the mixture.

Posted on Jul 06, 2010

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Softly418 had this problem...........

This could result from a thermostat which is stuck closed (but you have a new one), or a failed coolant temp sensor not allowing the radiator fans to run when they should, but I think you have a blown head gasket. Overheating is a classic sign of combustion gases getting into the coolant. The pressure also forces it out of the overflow.

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