over heating on 1993 BMW 318i

new thermostat and water pump. only has 200miles on these parts but recently has started to over heat. Does it need to be reburped or maybe a bad thermostat?

Asked by for the 1993 BMW 318i
There could be quite few things. First I'd make sure there is no air in the cooling system than check the fan clutch. The radiator may have excessive deposit, which could also cause the overheating.