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I have a 2003 Polaris Predator 500 Overheats coolant squirts out

I have a 2003 Polaris Predator 500, and it keeps over heating, or at least geting too hot, radiator spews fluid out the reserve resevior, ive checked the thermastat and it opens up just fine, (i beleive) i tested with a heat gun, ive also checked the water pump and it seems to be working fine, its spinning when on. Ive been told that maybe the thermastat is opening too fast and not giving the coolant long enough to cool, and i was told maybe the pump is not spinning fast enough. But im looking for more opinions, how can i check to see if its a blown head gasket? if thats what it is

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  • Vince Helms
    Vince Helms Jun 03, 2010

    i have a 2003 Polaris Predator 500, and it keeps over heating, or at least geting too hot, radiator spews fluid out the reserve resevior, ive checked the thermastat and it opens up just fine, (i beleive) i tested with a heat gun, ive also checked the water pump and it seems to be working fine, its More
    i have a 2003 Polaris Predator 500, and it keeps over heating, or at least geting too hot, radiator spews fluid out the reserve resevior, ive checked the thermastat and it opens up just fine, (i beleive) i tested with a heat gun, ive also checked the water pump and it seems to be working fine, its spinning when on. Ive been told that maybe the thermastat is opening too fast and not giving the coolant long enough to cool, and i was told maybe the pump is not spinning fast enough. But im looking for more opinions, how can i check to see if its a blown head gasket? if thats what it is

  • Vince Helms
    Vince Helms Jun 03, 2010

    i have a 2003 Polaris Predator 500, and it keeps over heating, or at least geting too hot, radiator spews fluid out the reserve resevior, ive checked the thermastat and it opens up just fine, (i beleive) i tested with a heat gun, ive also checked the water pump and it seems to be working fine, its More
    i have a 2003 Polaris Predator 500, and it keeps over heating, or at least geting too hot, radiator spews fluid out the reserve resevior, ive checked the thermastat and it opens up just fine, (i beleive) i tested with a heat gun, ive also checked the water pump and it seems to be working fine, its spinning when on. Ive been told that maybe the thermastat is opening too fast and not giving the coolant long enough to cool, and i was told maybe the pump is not spinning fast enough. But im looking for more opinions, how can i check to see if its a blown head gasket? if thats what it is

  • Vince Helms
    Vince Helms Jun 03, 2010

    i have a 2003 Polaris Predator 500, and it keeps over heating, or at least geting too hot, radiator spews fluid out the reserve resevior, ive checked the thermastat and it opens up just fine, (i beleive) i tested with a heat gun, ive also checked the water pump and it seems to be working fine, its More
    i have a 2003 Polaris Predator 500, and it keeps over heating, or at least geting too hot, radiator spews fluid out the reserve resevior, ive checked the thermastat and it opens up just fine, (i beleive) i tested with a heat gun, ive also checked the water pump and it seems to be working fine, its spinning when on. Ive been told that maybe the thermastat is opening too fast and not giving the coolant long enough to cool, and i was told maybe the pump is not spinning fast enough. But im looking for more opinions, how can i check to see if its a blown head gasket? if thats what it is

  • Vince Helms
    Vince Helms Jun 03, 2010

    thanx clay, i appreciate it alot

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5 Answers

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I have heard that Replacing the radiator cap works
Because when it gets hot that cap is supposed to relieve pressure and if it's not that why it shoots out the coolant

Posted on Oct 09, 2013

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If it is loosing coolant with no apparent leak, there is a milky substance on the dip stick, oil level is overfull, or it is blowing white smoke, you have a blown head gasket. If not, then check the radiator for debris. Clean it out throughly and remove any bugs, brush, or anything else blocking the flow of air. I recommend you drain the cooling system, flush the radiator out, replace the thermostat, even though you think it is good, and fill it back up with a 50/50 mix of antifreeze and distilled water. Start it with the radiator cap off and watch for air bubbles escaping. Keep it full of coolant. When you see no more air escaping, replace the cap. If that does not stop the overheating then either the radiator is clogged or the water pump is not pumping properly.

Posted on Jun 03, 2010

  • Vince Helms
    Vince Helms Jun 03, 2010

    ok so let me make sure i understand correctly, i need to thoroughly scrub and clean radiator, then replace the thermastat (even though i think its good), flush the system then refill, then start with rad cap off, and look for air bubbles, ( which im assuming means the pump is working, right?) once air bubbles stop and put the cap back on, and see if that works?, if not then theres a clog or pump aint working properly, did i get it?

  • NOT ME Jun 03, 2010

    Yes, you have it exactly right. The reason to watch for the air bubbles is to make sure no air is left trapped in the system. Trapped air will cause a hot spot and trouble. So make sure you bleed all the air out. While looking in the radiator you should see the water flowing from the bottom to the top, This will tell you the pump is working. Keep it full at all times. I hope you do not have a blown head gasket.

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Check the fuse for the electric radiator fans and/or the water pump has failed. If you have an aftermarket CDI installed this could also cause it to overheat.

http://forums.atvconnection.com/polaris/223072-there-overheating-problem-predator-500-a.html

Posted on Jun 03, 2010

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The way I check thermostats is placing it in a pot and heating the water in the pot to a desired temp with the thermostat inside. when the temp is reached, you can clearly see if the thermo is opening correctly. With this being said, i suspect the radiator may be clogged or have calcium build up, preventing the water/coolant to pass thru the entire radiator surface,allowing the radiator to cool the engine's water. With the cap off and ENGINE COOL!!! You can see if water is circulating. If so, There is a good chance the water pump is working correctly. To test for a blown head gasket would require a compression test, you may also get an idea of a head gasket leak if the oil is a milky/brownish color. Judging by what you have listed and checked, I suspect the radiator at this point.

Posted on Jun 03, 2010

  • Vince Helms
    Vince Helms Jun 03, 2010

    thanx ledsled appreciate it, i'll pressure wash the hell out of the radiator

  • GetMeOttaHere Jun 03, 2010

    ok...I see you don't reply....happy heating

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Hi,

Check the fuse for the electric radiator fans.Probably the water pump has failed.
clean the outside of the radiator. Take it to a quarter op car wash. Wash your radiator. Maybe blocked from mud, dirt, and other debris. Try this first. This is usually the number one reason for over heating on an atv.Try flushing the system too, but if nothing works then it really sounds like the thermostat is stuck or on it's way out.

let us know if you want somethin more else please accept the suggestion.

Thank You for contacting Fixya.com

Posted on Jun 03, 2010

  • Vince Helms
    Vince Helms Jun 03, 2010

    i havent like pressure washed the radiator but it looks pretty clean to me, like i washed it with a hose and sprayer, but nothing with the power of a pressure washer and as far as the theremastat, i have tested it and it does open, tested with a heat gun, but i have no idea if its too far out, how can i check, and the water pump does spin, i took the cover off and started the motor and it spun, so im assuming it is cycling the water

  • Vince Helms
    Vince Helms Jun 03, 2010

    oh and the fan does come on, it is working, and i did flush the system, and put 100% coolant in it

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