Keep an eye on it. May be left over from previous casualty. Flush cooling system with water and a detergent. Donnie suggested SHOUT to me back when my head gasket let go. Refill and watch it close.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.