that whenever I plug in my block heater I would hear a slight hiss and sometimes a light gurgling sound as if some coolant is moving around. I would not hear these noises normally until I plug the block heater in.

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Frank
84 500SEL EURO 101K ( JUST LIKE MY 1ST WIFE. GLAD TO GET RID OF HER! )
85 300D 310K (sold)
90 350SDL 184K sold
83 300D 118K (sold)
88 300E 153k (sold)
93 400E 105K (sold)