On Sunday afternoon. Two of my buddies came ridding with me. My one buddy on his 450s thinks he has problems with his fan. I have a Foreman 400 with 20w 40 oil and he's got 5w 30 oil. It was about 8 Celcius out. My fan went on several times and his didn't at all. We were hauling throug some good mud. Is it a loose connection? Fuse?

 

I have a new Rancher. I have just over 70 miles on it and have only heard the fan twice. Both times on an unusually warm 70 degree winter day. I was in mud for a short time when it came on but didn't seem to be working it that hard compared to some hill climbing and extended riding on cooler days. I too would like to hear the comments of others with more experience with oil cooler fans. How often do they run? What is normal? I don't suspect any problems with mine, just don't know what to expect.

 

The oil cooling fans usually take a longer time to go on than a liquid cooling fan takes. On our ForemanES, you have to run it pretty hard and for quite awhile before the fan will go on. In winter, if you're riding fast and not spinning the tires, it may not go on at all. If you're riding in snow and spinning your tires constantly, it will go on rather quickly. In summertime, it takes awhile also.

 

Rooster,
That makes sense. The times mine has come on, I have been spinning in mud (for a few seconds only). The same day, I was running fast and longer (several minutes on a straight away)and the fan did not come on. Recently, I saw another post on this forum asking about whether extended periods of open throttle were hard on quads engines. Based our observations of when the fan runs, it seems as though spinning in mud or snow builds heat alot faster than the faster riding. I realize that its more complicated than how often the fan runs....just something to think about.

 

I had my 00"foreman s since november and I have over 250 miles on it. My fan only went on once in that time. I thought it would come on more often than that but I guess I'm not the only one. I'll probably ask about it when I take it in to have the valves ajusted. Plus it hasn't been over 60 degrees up here yet either since I had it.

 

Slow riding, mud bogs, towing, snow riding, all happen at low speed at high engine RPM thus causing higher heat build up in the engine. Riding on a dirt road or an open trail at a faster pace will help aide cooling on an AIR cooled engine. My 450ES has the exact same problem.

 

but does the the oil temp light come on? if it doesn't your alright!!

 

A buddy of mine has a 450 and I got 350 HIS COMES ON QUITE A BIT AND I HAVE ONLY HEARD MINE A COUPLE OF TIMES. He put 27" MUDBUGS on it and sometimes when he shuts the engine of and turns the key back on the fan starts up again. Not sure if this is normal but almost everytime we stop his fan is running. The temperature is around freezing and we were running on hardpacked snow.

 

No oil light has never come on but the fan cooling cycle is normal.