really need help !!!!! over heating

[b_doornenbal]

A 2004 Summit 800 that has a can and scratchers we have changed thermostats, temp sensor, checked the rave valves, can see no pintched line any place on the sled. Not leaking out at all. Any ideas we don`t think it is the water pump because the rear cooler warms up

please help not sure what direction to go and dealers are out of options

 

[Hefe04]

I was once told if your trail riding and holding 6000 to 6500 rpm for long periods of time it can be the hottest point of your rpm range and can easily over heat.

 

[overkill131313]

explain how it over heats! going down a packed groomed trail (with scratches down), in the deep powder, just sitting on the drive way, then we might be able to give a better idea why. how hot does it get? do you have an inferred thermo gauge that you can point at the termostat or are you going by a (faulty) idiot light? so many variables! put a bottle of water wetter in it. my 900 over heats since I pulled out my front rad but doesnt now with water wetter. might have a air lock also if it had cooling system work done to it. raise the front end high and pat it on the back to burp it lol. will wait for more info before I joke any more lol.

 

[maxwell]

has it been severely overheated before? if the coolant jelled it could be blocking.

otherwise an airlock.

depending on the overheat temperature fins sstart to melt from the water pump fins. it may be flowing but not enough

yeah

more info

 

[Hefe04]

Also coolant to water ratio should checked glycol has a crappy heat transfer rate, water is the heat transfer medium and your glycol just decreases the freezing point.

 

[maxwell]

50/50 for a sled good to check or flush and replace

 

[Modman]

depending on the overheat temperature fins sstart to melt from the water pump fins. it may be flowing but not enough

Yep I would suspect fins are toast or water pump impeller is spinning on shaft at high RPM. Coolant system is pretty simple.

Otherwise you have a blockage somewhere (airlock or coolant jacket blockage). Does one side get hotter than the other?

 

[team dirt]

how about detonation, that will make water temps high. pull your plugs and try and have a look at the tops of your pistons for wash. 04 had the highest timing curve of all the 800 engines so if you have bad fuel or run regular it could very well be detonation.

 

[sledslut]

kinda sounds like a waterpump issue to me. we just did a motor for a guy with the exact same problem. rear heater heated up all the above but the water pump was wore out. its got plastic gears that run onto the crank whitch were toast. under idle it would run but open it up and it wouldnt pump water.

could be a number of things tho.

 

[b_doornenbal]

Just for a little more info, the heat lamp comes on after about 10-15 mins of riding in all snow conditions at about 5500 rpm or higher. Went it first started it was just on the trail conditions and fine in the powder but started to overheat no matter what the snow conditions. It did completely boil over once.
Tested the coolant an its fine.
One thing we did find is when we tried to pressure test the system we couldn't get pressure unless we pushed on the pressure cap on the coolant tank. I've heard if the seal of the cap to the tank isn't proper then the system won't pressure up and that could be causing the over heating.
We tried another pressure cap and still had the problem so wondering if it the neck of the tank itself. Now we have plugged the tank with a siliconed bolt and are going to try a run tonight to see if the heat lamp still comes on.
Any more suggestions would be great.

 

[Bogger]

Not sure if it's relevent, but I know if your rad cap on truck/car is buggered then the cooling system won't hold pressure, might be as simple as a rad cap......

 

[polarice]

the sole purpose of the pressure that a rad cap holds to is increase the boiling point of the coolant /water mixture
each psi gives an extra 3 degrees ie a 15 lb cap would increase the boiling point from 212 to 257 ....
id almost pull off one of your coolant hoses and see how much flow you have coming out of the hose

 

[maxwell]

this guy brought me his sled it was overheating too!!

 

[polarice]

had the same thing when i worked for a ford dealership had this car that would overheat only after you drove it for forty miles never complained of no heat tho .. put thermostat in it idled in the shop for a while not a problem ... took it for a good test drive overheated.. no heat as well... brought it back in told the guy i thought water pump ... guy thought i was nuts .....late friday afternoon wanted his car for weekend so i told him if i took it off and it wasnt the problem i would put it back on for free... needless to say took water pump off and impellers were rusted right off
got a good tip out of it tho

 

[powerteker]

yup, the more u drive over time it only gets worst....Water Pump!