1st Gen R53 Cooper S Heat not working, MINI overheating!

I missed something, apparently. The only good automotive coolants in the world are BMW/MINI coolant and Zerex G-05?

 

So, in 10+ years of ownership and forum trolling I've somehow not noticed this particular engine coolant concern. Did a quick search and it looks like if there's a problem with coolants it's because of the aluminum radiator. Some coolants include compounds (phosphates? silicates?) that are reactive and create the solids mentioned above. Might be time for my MINI to have a power flush and a fluid change.....better late than never.

 

Just make sure you bleed the system. I know it's not as big a problem on Minis as it is on other cars but it can still cause a problem. Check real close for small coolent leaks. When I worked on Fiats I had seen small pin holes couse the system to get air bubbles in them. The owner would not see a puddle on the floor and when the coolent was checked the level would look correct.
Check for coolent stains around the water pump, all connections and gaskets.
Hope you get it worked out.

I know Fiats, now every one knows my illness.