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Black oxide coating on T-stat? 700

posted by  Rolyak on  Wed May 10 08:56 CST 2006
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last visit: Fri Oct 24 08:03 CST 2014
[RELATED]

87 745 B230FT, thermostat failed at 290,000 mi. Looking inside the head, clean aluminum, stainless parts of the T-stat- spotless but the brass body is black, it was brass colored when installed. I change anti-freeze every two years. 50/50 with distilled water.

Inside of the radiator is also black (metal / brass)

I have been using the current Prestone green which I understand may be OAT extended life stuff.

Apparently this is a chemical reaction, just wondering if it may be harmful or is it actually protecting the brass from corrosion?

Until yesterday it had not been overheated since I bought it in 1997!





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