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Brown contaminated coolant in 2006 c7 engines

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Posts: 32
Location: 6268 Muskrat Bay Road, Brewerton, NY 13029
Is anyone experiencing a problem with brown contaminated coolant in 2006 c7 engines? This series has been flushed a least 3 times and it has continued to occur. This is in a Blue Bird All American.

seatonj User avatar

We have 5 buses with this same problem & the only fix that seems to work is let Cat dealer flush, change to different kinds of coolant. This seems to work for a while but this gunk has a way to come back a little at a time.


Posts: 32
Location: 6268 Muskrat Bay Road, Brewerton, NY 13029
Yes we have also been flushing the systems several times with out permenent success it seems to accumalate all over again. Thanks for the reply.


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