thanks for responses.

I shortened the belt to compensate for the smog pump......

I have had this car since august, and i did not drive it for a month while i changed the head-gasket.....honestly, this is the first time i hear the roar on my test drive this evening....my original fan clutch was never changed by the previous owner (183,000miles)...so maybe i am hearing what i was supposed to hear with a functioning fan? but it is quite loud when you are really hitting the gas!!

how to test it? i basically want to make sure nothing is wrong with the new one before the time to return it goes by ....

you say it is supposed to release? I think it gets progressively louder with rpm (when under heavy acceleration)

by the way, the correct belt length for the non-smog pump setup is 93 inches for my 2.8 m104 engine....the original length was 95 ......this is for the people looking at doing this....

thanks,

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1993 300E, 2.8 M104 .....