My 2003 SLK32 AMG supercharger has started to make some serious noise all the time. The car has 77,000 miles on it. The mercedes dealership replaced the supercharger idler pully in hopes to fix the problem, but was not successful. After arguing with them about the $170 charge for trying a pulley and taking it off, I have decided to troubleshoot the problem myself.

Is there a good way to isolate the supercharger bearing noise from supercharger clutch noise? It is not obvious using the screwdriver listening method. Is there a way to manually activate and deactivate the supercharger clutch?

The noise seems to be louder to me when listening the idler pully mount on the supercharger, but that may be due to the shape of that shaft and not actually due to the noise.

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George Carstens