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Regarding the lines that cross the valve cover and need to be removed to removed the valve cover: these are fuel lines which route the fuel to a cooler which is part of the A/C low side hose. You can undo these fuel lines; you will lose a bit of fuel but no refrigerant. Make sure you counter hold well at the fuel cooler.
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as ever
Paul
1989 560SL
1987 300SDL
1987 300TD
1983 BMW 633CSi
1972 280SE 4.5
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