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I just went through this on my 740. The fittings were well rusted but did release after applying a penetrant (used in the aircraft industry I think) and leaving for 5 minutes. I was lucky. I made a mental note to poke around the whole car every year to work various fittings prone to rusting or at least to apply some penetrant and some RustCheck. Bleeder screws are another example.
Frequent maintenance really is the best way. Course, with my luck, I will probably cause more damage than I am preventing. Murphy never sleeps.
Bill
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Volvo Info Site 1990 745GLE 16valve
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