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Go on, give me a clue (Ur quattro wiring)

MB engine, there is a large multi-plug on a sensor that is fitted in the
base of the thermostat housing. Two blue cables, two black ones. The two
blues and one of the blacks go into the loom sleeve but the other black is
about 3 inches long with a stripped end but isn't connected to anything -
should it be?

Same engine, there is a two contact multi-plug (two brown wires, at least
one appears to have a yellow tracer) floating free near the back of the head
on the left side near the heater control - same question, should it be
connected to anything?

Jim Haseltine