I drove about 300 miles home on a broken radiator with the cap loose. that way there is no pressure but you may have probloems if the ambient temps are high where you live.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique