overheating

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seanmurphy26

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Oct 31, 2004
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milo maine
hey, i have a 98 700 sx with psi triple pipes and peak head.

before i put on the peak head i never ever had a problem with overheating, and now that its been on for about 350 miles the water temp light goes on and off and stays solid for a while. i was driving in all fresh powder and its doing it now. could the sending unit be bad? has this ever happened to anyone? thanks. just curious to as why this thing is doing it.

could it be a air bubble by the sending unit? so it woud measure air temp instead of water?

i bled the system well and all the heat exchangers are working.

TIA
 
The same thing is happening to my wife's 600 and I've bled, and bled, and bled... I go sledding w/ a mechanic and he said to change the thermo. We'll find out next weekend if that in fact did the trick. Are you blowing coolant out of your overflow bottle?
 
Just a question. Do you have the rear heat exchanger on your vmax? Maybe your making more power than you have cooling for.

Besides that ya you might have an air bubble. Have you bled it with the motor high and the tail low? What I am saying is if it does not seem to be working one way do it the other.
 
@seanmurphy26,

when the temp light come's on does she feel hot(jugs,heat exchangers)???


@trapow33,

what 600 sled does your wife have??

yammie stopped putting thermos in after '96 except srx's and '97 vm8's
 
Since you had the heads off I would bet on the air bubble scenario. I just rebuilt the top end of my machine and everything works great but I was having a problem with my light coming off and on. I removed the seat twice elevated about two feet and all the air cam out till solid fluid but i still saw the light. I also had a bit of coolant blowing out the overflow. I found that with the cap off I pumped the hose that runs under the clutches and I could hear i burping and after a few minutes of this I rode about 100 miles and havent seen the temp again. Hope this helps.
 
ive bled it like 3 times, front and back.

as for making too much pwoer for the heat exchange, the light never came on when i had the pipes, and i figured the peak head would help with cooling

it the hed doesnt feel any hotter then normal either.
 
ok so i bled the system at least 6 times, still the light is coming on, when i gun it and go slow it goes off for a little, thing is now it is running really hot and blowing over flow everywhere. there isnt a thermostat is there? i dont think there is. what else could this be?

spark plugs look good so i dont think its a head gasket
 
i actually just looked at it and when it is warm its not bent at all.

plugs look better then they ever have

all heat exchange are working...

i dont understand wtf is going on
 
oh and the hose comes out of the heat exchange, goes to stock hose width, then srx width, then back to stock. i dont think that the connectors would restrict flow enough to cause this much problem. but i guess it is possible...
 
seal

it might be your seal behide the water pump, it sounds like what my mmax 700 was doing until some one on this site told me too change the water pump seal...reddog
 
ride it for awhile get it hot, then park it verticle on a snowbank and cracking the bleed screw on top of the head (all while running) then tightening the screw back up and parking on level ground, when it cools adding coolant, slow and steady trying to work the air bubbbles out. same with the rear. im pretty sure thats the right way to do it
 
check to see if ur hoses are hard when the sled is running. if they are its mostly ur head gasket leaking compression into the lines. when it does that it binds the system up with pressure. it may just be doing it after hard pulls and u might not notice it when its idling cause the motor isnt working that hard and not putting alot of pressure into the lines. id say put it on a stand and run it and feel if ur lines get hard. happened to my brothers sled he changed the impeller and seals and every thing didn't make a dif and it was his head gasket.
 
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