3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
I assume you mean bleed the system of air. There should be a bleeder screw on the thermostat or water pump housing and with engine warm and idling, crack that scew a bit until coolant starts to flow and when no more bubbles come out, tighten the screw.
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