On mine, the check valve is placed between the roller height adjustment switch, and a T fitting installed into the vacuum gauge line. The blue side is closest to the 4 position roller switch by the headlight switch, the black is closest to the vacuum line on the gauge in the instrument cluster.
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John
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E
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