My car keeps using coolant. 6-8 Litres in 19,000kms. the overflow has a crack in it but has been redivirted back into radiator. is that bad?
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Then fitt new thermostat and refill.
I then allow the car to idle for about an hour to insure thermo fans kick in and temperature stays below half on gauge. Thermo fans should start and stop to control temperature.