I have an 02 rubi that overheats. When I use it for pulling my lawn sweeter it will overheating in about 20 mins. My fan does not kick on, but it seems to be heating up too fast regardless. my question is should I assume its the fan.

 

I am not a qualified mechanic, but have you tried cleaning the radiator? If you have been riding in dirty water or dusty conditions the radiator may be plugged. That would be a simple first step before someone on this forum adds more technical stuff.

 

I should have put that on my earlier post, but yes I have done that. I also flushed the radiator and put engine ice coolant in it and still get the same thing.

 

I should have put that on my earlier post, but yes I have done that. I also flushed the radiator and put engine ice coolant in it and still get the same thing.

 

find a wiring diagram for your machine and check every fuse in your system. If no fuses are blown, you can unplug your temp sensor that controls the fan, and test it for ohms with a multimeter while it warms up and see if the meter shows a change once the engine warms up. If the temp light comes on and there's no change in resistance from the temp sensor, then that's probably going to be your problem. You can also connect 12volts directly to the fan to test the fan itself, and would probably start there then do the sensor check.

 

I have a fan override switch so that I can engage as needed. However, I think my machine had a long day and it started cutting off more. I've seen this as an issue with the Hondas but cannot confirm if that's what's going on with the quad. Is there something I can do such as add a different kind of coolant to help with overheating?

 

I put Engine Ice in mine. Its a premixed coolant that is supposed to run your quad about 50 degrees cooler. I have noticed a difference but it still overheats. I am going to replace the fan on mine. I think its seized up. I can 't spin it freely with my finger.

 

Not too sure what else it can be if you've checked what other posters said above. I'll consider the Engine Ice for mine and see what happens.

 

I would just replace the Fan thats all thats probably wrong with it.. Hondas typically don't overheat often....

As for better coolant if you live someplace where freezing isn't an issue distilled water mixed with water wetter additive work miracles!