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Found 5 results

  1. After riding my new (to me) 2000 trail boss, I noticed the fan NEVER ran, even after letting the quad idle for 15 minutes. I thought I had a problem with my fan or my thermister, so I did some checking and found both were working as they were designed...turning on at 260 degrees F. A further check on the various forums found that others noticed their fans not turning on. I believe that this is a design error. The thermister, sitting on the downstream side of the radiator, is waiting for the oil to literaly cook before turning on the fan. I mean, if the oil has reached 260 degrees after going through the radiator, how hot is it in my engine? My belief is that the best oil temps are just above boiling (215 to 245 degrees F or so), so as to help eliminate any water build up, but keeps the oil from cooking. I also noticed that the fan blows air through the radiator, then across the cooling fins of the head/jug. I feel it would be nice if the fan would come on at lower temps, to help with cylinder cooling as well. So I came up with a mod that has really seemed to do the trick. Basically, I just placed at 10K ohm resister across the the thermister wires, so that it is wired in parallel (from one wire to the other). The result: Before: Fan would only turn on at 260 degrees F, off at 240 F. Engine temp light activates at 290 degrees F. After: Fan turns on at 245 degrees F, off at 225. Engine temp light activates at (estimated) 285 degrees F. After making the mod, I tested it, and after idling for 10 minutes, my fan turned on!!!! Oh, and when I placed the resister jumper, I was able to keep everything water tight. I pulled the pins out of the harness that attaches to the thermister wires. Once the pins were out, I used a needle to poke a small hole through each of the two "sealing bushings" that were attached to the wires. I then threaded the resister leads through these small holes, and soldered them to the back ends of the pins. Then I put the pins back into the harness, and for good measure covered the back of the sealing bushings with silicone, also covering the resister in the process. If the temp figures are not low enough for ya, you could use a lower value resister. Go with a 5.6 K, and your fan would turn on at approximately 230 degrees, off at around 200. If you already have a soldering gun, solder, and silicone, the mod only costs .99c for the resister! This mod was done on a 2000 Trail boss. I'm sure it would work for other years and/or models. Check your owners supplement...if your thermister activates your fan at 260 degrees with 2519 ohms across, then it will work.
  2. I was running cat 500 at low speeds for about 25 minutes today, i mean very low 3-5mph then to zero back to 5 so on so on, and when I parked my radiator was bubblin over a bit and steaming with a little cooloant leaking from somewhere but not much. My question is about cooloing fan, i never hear it engage or running. My Honda you have to leave the key on for a few minutes to let the fan run before shutting down, but my Cat i cant find anything in owner man. except "keep it free of debris with hose". How do I know if cooling fan is operating properly, should i hear it after shutting down engine. Its a 2005 but i only have 252 miles on it. Any info would be of help and thank you to everyone for your help with carb and fuel overflow, there was dirt in carb, took apart and cleaned myself w/no prob now works great, even though i did not install in line fuel filter. Where do I get one? Thanks again!!
  3. I believe my cooling fan switch has gone bad, the dash goes out except the over heating symbol flashes but the engine is not hot to the touch. So i used a jumper wire from hte accessory side of the ignition switch, so the fan runs if the key is on. A new switch is about $110.00. Has anyone else done this, will it be ok to run like this as long as i check for overheating manually? Or should I replace the switch?
  4. POLARIS RZR GAINS 53 PERCENT MORE COOLANT CAPACITY WITH FLUIDYNE® POWERSPORTS RADIATORSAN BERNARDINO, Calif. (July 16, 2009) - Peak engine performance is only achieved at optimal coolant temperatures.Like many UTV motors, the RZRs 760cc Twin sometimes struggles to accelerate its half-ton of side-by-side fun and remain properly cooled in less-than-optimal conditions, such as when slogging through More...
  5. Liquid cooling uses a radiator filled with coolant to keep your quad from overheating... More...
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