Last summer I was riding my John Deere 1959 530 around my neighborhood in lower gear (why I don’t know) when my tractor stalled and white smoke came out of the muffler and it looked like other places but it happened so fast I don’t remember. I did NOT try to turn the engine over at that time. Also, just after this happened, I spent two months in hospital and I have not been able to work on the tractor until now. I thought I had blown a head gasket but upon checking the compression I found I have around 150 on a cold engine. I assume the head gasket is good. I, being a novice at repairing John Deere tractors did notice when cranking the engine that the fan was not turning. So my question is “is the fan to turn when the engine is turning”?