Warren, your description is a bit cryptic. Is the part located toward the front or rear of the engine block? You describe the part as having "2 lines going into it." That leads me to believe that these lines are not electrical wires, but tubes perhaps. Is that what you mean? Everything at the back of the engine has electrical wires attached to it, and they're mostly temperature sensors. At the front is a part called thermo vacuum valve, which has two rubber elbows connected to it, that are fitted to two plastic tubes. Providing a photo would clarify things.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't