does over flow tank need to be vented? System doesn't pull anti-freeze back into engine...
Oct 9, 2009 at 5:53 AM
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CH112063
✓Experienced Mechanic
1,320 POSTS
No. It is a closed system. Have the rest of the whole system pressure tested to hold pressure. Also have the radiator cap checked or replaced. The overflow hose may be split also. ok Joe