I smell a rat. Blueish color? The overflow tank/coolant reservoir is a type of plastic that doesn't melt unless something other than antifreeze is put in them.
I would get a sample of this blueish stuff and take it to the Dealer.
Sounds like someone contaminated the coolant with something.
2001-2005 Honda Civic Coolant Reservoir - OES Genuine
List Price:$35.34
Our Price:$29.95
»
www.drivewire.com/vehicl ··· ry-tank/