<div class="FTQUOTE"><begin quote>Originally posted by: az800

Yes, new rad in rebuild.



If I unplug the temp sensor switch, will the fan run constantly??</end quote></div>

That just proves the fan can work.


Does the fan come on with the temp sensor pluged in,while on a ride?

Every Polaris I have seen overheat had water boiling out of the reservoir bottle.

 

I have bought two new belts for a '05 500 HO and this 800. That was over a year ago but it seems they were $70 apiece. Word to the wise...the belt on 800 won't tolerate top speed for more than a few minutes. I had to use the highway to get out of the sh*t one day and drove down the highway at 65 for over 10 minutes. I was feeling pretty good about my bad machine until the belt became a million black particulates bouncing down the highway, and I was stuck again. Thankfully, your thumb will work much better next to the freeway than it will out in the desert.

 

Check it out see if the rad fins are as hot as both upper and lower hoses. If the fins are cooler its pumping it in and out. Maybe a bad Rad as you will see I got one on a new unit.

 

If it runs hot and starts puking out coolant and the fan isn't working then you've found your problem.

 

I am sure that the fan is sound. The service manual describes a switch bypass test. Turn the key on, off, on, off, on and leave on, all within 5 seconds and you will get the "blink codes" on the speedo. I got a code 42 which says it is the temp sensor. When you unplug the sensor and turn the key to on and the kill switch to on (do not start, just key on) the fan will start running and stay on. When I start the machine the fan cuts off because the engine is not hot yet. If I unplug the temp sensor switch before a ride, the fan will never come on right?? So, if I want to turn the fan on and leave it on I need the aftermarket temp monitor and fan switch, right??

 

<div class="FTQUOTE"><begin quote>Originally posted by: contentsunderpressur

If it runs hot and starts puking out coolant and the fan isn't working then you've found your problem.</end quote></div>


Should I surmise that the temp sensor is causing the fan not to come on until the engine is already too hot?

I am in Arizona and I don't have to tell you how hot it gets here. I think I'll get the aftermarket stuff and install so that the fan can run all the time in summer. Any problem doing that?

 

So with everything plugged in,you never hear you fan come on while riding at any point?

 

<div class="FTQUOTE"><begin quote>Originally posted by: TLC

So with everything plugged in,you never hear you fan come on while riding at any point?</end quote></div>

No, with everything plugged in the machine runs great for a while. Soon, the fan will cycle on and off like I think it is supposed to normally. But then, usually after a period of me getting on the thorottle for a while, or climbing a hill, the HOT light comes on and the fan should be on constantly at that point...but it isn't. It almost seems that the heat starts climbing and the fan doesn't kick on in time to keep the engine cool enough to avoid the HOT light...then it can't recover fast enough.

 

So your only indication of over heating is the hot light coming on? The ATV does not boil over at the bottle or act up in any way?

 

No, I'm sorry...you tried to ask me that ? 3 times now and I haven't been clear. The fluids definately boil out the top of res.