Hey guys,
Merry Christmas!

What have you used to remove mineral deposits or scale build-up in your coolant system? I see some products advertised, but what do you recommend to get rid of it?

I got a bunch of crusty mineral deposits in my cooling system, it is on the t'stat neck and crept in under the coolant hose and gave me pitting corrosion on the neck of the t'stat housing. There is some on the tops of the radiator core tubes.. must be more of it in places I can't see. I wire brushed the snot out of the t'stat housing, and primed and painted it really good. I plan on gooping the neck with sealant before sliding the hose back on and clamping it. That should conceal the sealant under the hose and keep it OEM looking.

I researched the background and basically it seems that decay of the corrosion inhibitors in the ethylene-glycol coolant can lead to chemical changes that then deposit themselves as scale.
My lesson learned seems to be to flush and refresh the anti-freeze every 3-5 years.

Thanks,
- Art