The actuator motor should pull approx. 130mA. Anything significantly higher than that CAN blowout the output transistors in the amplifier.....mine is currently pulling about 380mA; I'm sending off for a rebuilt one here very shortly.
Apparently, the actuator motor can fail in a certain way that ends up shorting the amplifier outputs....and thereby blowing-out the amplifier. This is a common failture scenario.
But, yes, the motor should be smooth and quiet.
Also, DON'T activate the solenoid AND the motor at the same time. This is NOT suppose to happen and can damage the actuator from what I understand about the unit.
1985 300SD - 'Grace' (198K mi.)
2010 Honda Fit Sport
2013 Honda Accord Sport
1996 Lexus LS400 (Retired)
1995 Ford Contour SE (Retired)
1976 Porsche 914 (Sold)
1972 Datsun 240Z (RIP)