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    Overheating ski-doo 600 2003 zx chassis

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    • Member since
      October, 2016
    Overheating ski-doo 600 2003 zx chassis
    Posted by Green Bay ski-doo on Tuesday, October 11, 2016 10:27 AM

    Hello,

    I bought a 2003 ski-doo 600 last year. Numerous times in a variety of snowconditions it would show temp light so I would have to stop and let it cool down. I was the only one who had to do this a number of times. The engine was rebuilt when the carb boots cracked. It seems to run good but just do not want to ruin motor. I asked dealer if it is the thermostat, but they said they are not very common and did not have one in stock. Another said if motor was blown you should change thermostat. I pulled two small bolts on head where I thought it was, but that part seems like it is bolted from under the head. Do these just run hot or is there any other suggestions. 

    How do I change thermostat and how do I know if head needs to be pulled?

    Does the antifreeze that is supposed to keep engine cooler really work?

    Thank you!!

    Moderator
    • Member since
      October, 2013
    Posted by Ross Halvorson on Tuesday, October 11, 2016 12:29 PM

    I don't know of an engine that "just runs hot" enough to constantly trip the temp warning light. I also don't know what your dealer meant by telling you "they are not very common." The Ski-Doo 600 models in 2003 had a thermostat (part #420922517, $34.99), and they are readily available to order from Ski-Doo's parts website here http://parts.ski-doo.com/Index.aspx?s1=2gogqjfouqgkhaj6c2ceg1abe1&catalog_id=0&siteid=1

    You'll also find drawings of the engine assembly on that website. A quick look at the cylinder, exhaust manifold, reed valve drawing will tell that you are correct in your assumed thermostat location under the head. 

    Are you sure everything is correct with how your cooling system is flowing? Often times an air bubble in the line can cause improper cooling and a temp warning light to trip in a sled that otherwise seems to run well. Also, I would consider draining the coolant and refilling with XPS Coolant (BRP part #219700362). You could also check your thermostat when you do this by removing it and placing it in hot water. If it opens up, then you don't have a problem with the thermostat. But I don't believe a thermostat issue should cause the temp warning light to go off.

    • Member since
      October, 2016
    Posted by Green Bay ski-doo on Tuesday, October 11, 2016 6:50 PM

    Ross Halvorson

    I don't know of an engine that "just runs hot" enough to constantly trip the temp warning light. I also don't know what your dealer meant by telling you "they are not very common." The Ski-Doo 600 models in 2003 had a thermostat (part #420922517, $34.99), and they are readily available to order from Ski-Doo's parts website here http://parts.ski-doo.com/Index.aspx?s1=2gogqjfouqgkhaj6c2ceg1abe1&catalog_id=0&siteid=1

    You'll also find drawings of the engine assembly on that website. A quick look at the cylinder, exhaust manifold, reed valve drawing will tell that you are correct in your assumed thermostat location under the head. 

    Are you sure everything is correct with how your cooling system is flowing? Often times an air bubble in the line can cause improper cooling and a temp warning light to trip in a sled that otherwise seems to run well. Also, I would consider draining the coolant and refilling with XPS Coolant (BRP part #219700362). You could also check your thermostat when you do this by removing it and placing it in hot water. If it opens up, then you don't have a problem with the thermostat. But I don't believe a thermostat issue should cause the temp warning light to go off.

     Thank you for your answer.
    If my heat exchangers are getting hot is the thermostat fine? 
    What is involved with pulling the head if I wanted to change stat?
    Thank you

    • Member since
      March, 2013
    Posted by dq600 on Wednesday, October 12, 2016 9:56 AM

    to pull the head first syphon all the coolant out of the fill bottle loosen hose clamp at thermostat cover, remove top hose and all head bolts. after head is off carefully remove thermostat cover. the bolts are prone for breakage so go easy. then change the stat and put back together. you may want to replace the inner head gasket o-ring while you are in there. other seals should be reusable. head torque is 22 foot lbs. first go 10 then 22 and retorque after warm up. as long as the thermostat cover bolts come out this is a pretty quick repair.

    • Member since
      October, 2016
    Posted by Green Bay ski-doo on Friday, October 14, 2016 5:52 AM

    Thank you!

    The heat exchangers are getting hot.  Does that show thermostat is opening and not the problem?

    Should I add ice scratchers and maybe extend snow flap along with adding water wetter to antifreeze to keep it cool?

    • Member since
      March, 2013
    Posted by dq600 on Friday, October 14, 2016 9:01 AM

    BRING IT UP TO TEMPERATURE ON A STAND, CHECK CYLINDER TEMPERATURE WITH A HEAT GUN. LET IT COOL CHANGE THERMOSTAT AND BRING UP TO TEMPERATURE AGAIN, THIS WILL ELIMINATE THE THERMOSTAT AS THE PROBLEM IF YOU DONT SEE A DROP IN CYLINDER TEMPERATURE. IF YOUR NOT PROVIDING SNOW FOR THE HEAT EXCHANGERS  IT WILL GET HOT.  

    • Member since
      July, 2005
    Posted by dyna-tek racing on Wednesday, October 19, 2016 8:06 PM

    A longer snow flap will help we even tie them down so they don't flip up when running hard,that motor doesn't have any history of running warm,if anything they are the most reliable series three motor built

    master mechanic-outboard,sterndrive,pwc,snowmobile. dynamometer facility -crank repair -cylinder repair-trail and race motors-shock service clutch machining and balancing. complete racer support- free technical support-racer discount programs Todd Guthrie 1-260-316-2839 or like us on face book and keep up to date on monthly specials using our facebook page.See new innovative product as soon as it gets built

    • Member since
      October, 2010
    Posted by Sleddaddy_Fro on Wednesday, December 21, 2016 10:31 AM

    My son has a 2003 MXZ Adrenalin 600 HO. It has an intermittant overheating issue. We changed the coolant and replaced the thermostat with little improvement.  We did notice getting more snow into the tunnel helps. Then one day I saw his snow flap caught up in the track decreasing the snow pulled into the tunnel.  I caught up and he pulled over and said the Hot sensor was starting to register again. We pulled the flap down and all is well.  Since then, the second he notices a flickering heat sensor, He's pulled over immediately to check the flap.  It's the same story every time.  The flap is riding up the track blocking snow entry.  Running with little or no snow going into the tunnel causes the heat sensor to trip.  Maybe a new flap is in order but the problem is clearly with the flap.  Just my thoughts. 

     

    • Member since
      December, 2016
    Posted by Nytrorider on Thursday, December 29, 2016 8:39 PM

    [quote user="Green Bay ski-doo"]

    Hello,

    I bought a 2003 ski-doo 600 last year. Numerous times in a variety of snowconditions it would show temp light so I would have to stop and let it cool down. I was the only one who had to do this a number of times. The engine was rebuilt when the carb boots cracked. It seems to run good but just do not want to ruin motor. I asked dealer if it is the thermostat, but they said they are not very common and did not have one in stock. Another said if motor was blown you should change thermostat. I pulled two small bolts on head where I thought it was, but that part seems like it is bolted from under the head. Do these just run hot or is there any other suggestions. 

    How do I change thermostat and how do I know if head needs to be pulled?

    Does the antifreeze that is supposed to keep engine cooler really work?

    Thank you!!

     

      Your dealer should be able to access a service bulliten for this issue! Your sled is not overheating! I had the same sled! Bought new in January of 03.  Ski doos fix was to add a diode into the wiring. This changed the resistance and raised the limit for the temp light to come on.

        A new sending unit may fix the issue now. But ask your dealer to check service bulliten's for 2003. You may also find it on Doo Talk

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