Being from Florida, I abhor rust. My advice would be that if the lines are so rusty they are causing problems, you undoubtably are at risk for brake line and fuel lines also and who knows what all else. I'd off that car and get a southern car without rust to start with. They are really getting cheap.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician