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For my old El Camino, I flush and replace the coolant every other spring. The radiator has virtually no corrosion visible, and the water pump lasts about 70,000 miles. It is free to replace for me since I bought a lifetime guarantee water pump 29 years ago.
I have a pressure coolant flush and refill setup.
As you well know, 6 month old coolant and a new sensor should not be looking like that. Is that sender a BMW branded sender, or some aftermarket one of the "wrong" material?
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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