[Kenwood] TS-940S Cooling Fan Problem

[Bill Stewart]

I have a TS-940S, s/n 6040XXX, which has a sluggish cooling fan (on left, facing front, behind the power trans.). Sometimes it will not start. I have shot WD-40 in it and tried to get oil to go down the shaft but sometimes it still won't start and if it does start, it turns slowly & erratically. I measured the voltage to be around 18VDC with the fan disconnected and connected, a fluctuating .5 to 1.5VDC with the erratic rotation.
Questions: 1. Is this no-load to load voltage drop normal?
                 2. Does the voltage and fan speed increase with temp. rise?
                 3. If the above is a problem, are there any mods. to replace this fan or maybe make the fan run all the time?
The fan runs ok if it gets beyond the low start-up point (on a seperate DC supply).
Any comments will be appreciated, thanks...Bill K4JYS