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Message: <blockquote data-quote="jarance" data-source="post: 205647" data-attributes="member: 21">The bimetallic strip basically control the fluid coupling of the cluth. When it is cold, less oil will flow thru the coupling making it go slower. When the engine is hot, the bimetallic strip will expand and allow more oil to flow and make it go faster.What your mechanic have done is to allow oil to flow more and cause the fan to spin faster and cool the engine more.There are pro and con in doing this..pro..The engine runs at a lower temperature. It is quite useful if you are stuck in a traffic jam and on a hot day.con..Slightly more load on engine as you need to tap a bit more power to rotate the fan.Engine not running at optimum temperature.I have done mine by adding a bit silicon oil rather than bending the strip. Temperature running at lower notch. About two clicks but still above the blue or cold zone. Feel more easy as engine is running at slightly lower temperature.btw mine is e36. not sure yours is the same principle.</blockquote>