The fan should spin free.
The normal bearing problem is that the shaft seizes to the bushing. at that point the bushing spins in the housing. That is not a bearing and lubrication won't help for long. You must be sure that the shaft spins in the bushing not the bushing in the housing.
I can't tell you whether the controller goes that high, it doesn't on the later systems. but it might on yours.
Bosch Master, ASE Master, L1
33 years MB technician