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I think the coolant reservoir tank cap is supposed to vent on reverse pressure - maybe cap is bad? It also took several re-flushes with Tide by the shop to eliminate the brown goo. They did not charge for those return visits, and eventually the coolant was normal.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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