Green Dust in Coolant Reservoir

peanut

Registered User
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As we get closer to summer I went to check my coolant to find it dry even tho my tbirds temp has been fine but it has this greenish dust in it. Is it ok to fill up with this in there and if not what is it and how should I go about removing it? Thanks.
 
Looks like oil/exhaust residue. Propably blown head gasket, mine was the same when it blew. You should remove the tank and clean it, not sure about the best method, I have tried with a brush and soap and it works ok.

If it gets dirty again it must be the head gasket or timing cover gasket could also leak oil into coolant.
 
Tried many methods of cleaning the tank. Nothing worked except ultrasonic cleaner. That was the best and least effort method. Chemical used was something similar to dish soap. Getting it cleaner than this would require some really strong chemicals.
 

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