How well does a coolant flush get rid of the brown buildup caused my Dexcool? The Dale Jr car I just bought had the coolant supposedly flushed last year. It has been changed but I don't know if it was flushed.

I replaced the radiator cap last night and the original cap had quite a bit of brown buildup on the underside of the cap. There was also some in the radiator neck.

It looks like I probably need to get the system flushed again and done right and have the thermostat changed.

Where would you recommed getting this done? Jiffy Lube did this one. I won't be doing it because of the weather. Thanks.

Wayne