Well putting a new cap on would just eliminate that from the equation. I did see some dark flakes in my coolant reservoir (overflow) so maybe a flush would help???? Last time I did a flush in my van I lost my intake manifold gaskets so I'm a little wary on the performing it. I'm a little lost now I was going to rent a pressure test kit but they wanted $180 deposit which I'm not messing with. I think I'll replace the coolant since I bought a jug today anyways (dexcool).
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