Sounds like corrosion. Buy a coolant tester and test the fluid. How is the levels your oil levels? Any gunk on the oil cap or in the coolant system? Is the bottle going murky and cloudy?
Was the radiator new or 2nd hand? If your levels are OK and temps are fine I wouldn't worry tbh. If you really wanted piece of mind, do a rad flush and fresh coolant.
Factory coolant is green isn't it? Do a rad flush and flush deionized water through then fill with type 2. If your levels are dropping it's using/leaking coolant.
The type 2 is definitely blue but the stuff they put in at the factory is green. Or at least it's green when it's old. Sounds like someone's put G12 coolant in yours at some point and that's what's mixed with the type 2. I wouldn't worry about it but my OCD would make me change it and flush it so it's all blue.
The type 2 is definitely blue but the stuff they put in at the factory is green. Or at least it's green when it's old. Sounds like someone's put G12 coolant in yours at some point and that's what's mixed with the type 2. I wouldn't worry about it but my OCD would make me change it and flush it so it's all blue.