Hi just wondering what this part is (circled in red) and i filled it up with water. is that bad?

Asked by May 13, 2015 at 09:42 AM about the 2005 Honda Civic

Question type: Maintenance & Repair

1 Answer

64,415

That is the engine coolant reservoir. A 50/50 antifreeze mix goes in there. Although water won't hurt anything, putting plain water in there dilutes the antifreeze mixture.

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