While taking a test drive after replacing the timing cover gasket I began to hear a cricket type noise emitting from under the passenger side of the dashboard. The noise only seems to be intermittent and directly affected by the fan speed of the HVAC system. I've noticed that the A/C doesn't seem to blow very hard at all in this car, but I initially thought it may simply be bad duct design. Are fan speed control and noisey blower motors common among W210's?

Ted