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Antifreeze turns black
Posted: Sat Jul 15, 2017 11:33 pm
by Bear
Hi I have a f32 with 1986 crusaders 350 the antifreeze turns black these engines were salt water cooled for a few years then converted back to fresh water cool , I flushed both engines with radiator cleaner put fresh antifreeze in, was clean for awhile then turned black again assuming its rust has anyone had this problem
Re: Antifreeze turns black
Posted: Sun Jul 16, 2017 2:23 am
by prowlersfish
Most likely deposits from being salt water cooled . Pull the pipe plugs/ block drains on both sides of the engine ( black stuff settles there ) flush it out . fill with distilled water & coolant and a good ant-rust . may have to do it more then once . Good luck
This is assuming no other over heating issues . would not hurt to have coolant sent off and tested
https://www.walmart.com/ip/Gunk-C1012-1 ... 4=&veh=sem