[qcj]

Ken, mine seems to jerk more on turns than going straight.  I think a little pressure on the wheel will make one feel it more.   I think what I would do is bring the coach up to operating Temp. while setting still.  Put the engine on fast idle and put a little left or right pressure  on the steering wheel and see what happens when the fan cut on.  I would open the back engine compartment and have someone watching the fan to let you know when it cut on, just in case you don't feel it.  I do think you need to have pressure on the steering wheel to feel it.