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The coolant in my c5 would keep disappearing. First I thought leaking head gasket but I have no white smoke coming out of the exhaust and the engine was running as strong as ever. I check the water pump and hoses, no leaks.
Then this morning when I was filling up the expansion tank, I notce where the fluid had been going. The expansion tank had a leak where the clear bottom and black top met. Wow. What a pain. SO to remedy this and to prevent future problems I am going to buy this: