My chevy cavalier z 2.4 has leakage from plastic coolant tank .leakage is on the plastic cap.

Question

I replaced new cap but it does not help.While car is on idling its ok but on driving its hapens.Temperature is ok,radiator fan works.I replaced water pump and thermostat.

Answer 1

And everything is probably working just fine. One small thing, though. You have too much coolant in your overflow tank and it's coming out through the vent in your cap. When the engine is cool that bottle should not be more than half full. There is a mark on the bottle that shows the proper fluid level.