I drove around with flush in my system for about 2 weeks or 400 miles, system came out looking like new, no damage was done. As others have suggested take a look at your monovalve.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k