yamaha sx 700 air pocket in coolant system

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panthers06232

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i have a 1997 yamaha sx 700 it has a air pocket in the coolant system i cant seem to get it out is there any tricks on how to get it out any helped would be appriciated
 
it will not stop overheating i dont no if i should keep riding it we have rode it and rode and it still overheating my mechanic said it has a air pocket but it will not come out
 
There is bleeder on the top of the head where the hose goes in the top and and one in the back cross-over cooler in the back of the tunnel. Start the sled and run it, lift the back up about 1 1/2 feet and open that bleeder, air should start coming out, if nothing comes out, but coolant, then let the back down and lift the front up 1 1/2 feet and open that bleeder on the head some trapped air should come out of there. You might have to repeat this a few times, as you do, feel the running boards they should start warming up as the air is bleed out. You could also open the cap on the main hose, wait til it cools to do this, then run the motor to see if the coolant moves, if it doesn't you might need to replace the waterpump.
 
IF you still keep getting air it could be a bad head gasket I had that prob last yr
 
onmy SRX after rebuild,I just ran th motor and left the rad cap off.I can see the coolant moving and the air just escaped this way,exchangers got warm pretty quick.On my 600 after rebuild was a different story.Took seat out.opened bleed screw ,was getting a little concerned.It took some work to get the air out of the system.
 
panthers06232 said:
the sled would use coolant if it was a head gasket wouldnt because it isnt using any coolant jus overheating
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Mine would just become air bound no matter how well I bleed it. I never lose any coolant it would just push it to the overflow
 
after my rebuild I had the same problem...... I finally solved it by rolling the sled on the left side till it stopped bubbling..... topped it off with collant.... rolled it on the right side till it stopped bubbling..... topped it off....

repeat 'till the problem is solved....... this is the physical exertion method, rather than the wrenching method!!!
 
my coolant isnt going to the overflow could it be doing it because it has a goose neck for a thermostat but there is no thermostat in the neck i just cant belive the head gasket is blown with the way the sled runs and no smell of coolant
 
If the head is warped, Red Head, the compression will leak into the cooling system. This will cause air to be introduced into the system causing an air pocket and turbulance in the water pump. If you notice excesive amounts of pressur in the cooling system, check the head and gasket. The single one piece head is common for this. Do not just drive it if you have an air pocket, good way to ruin your engine. Good Luck Al
 
When it overheats, are you actually blowing pressure into the overflow bottle? When you run the engine, check and see if you have bubbles coming up out the cap area. Did you do any work to get air into the system? Al
 
Air locked

I have been having this same problem with my 97 SX 700. I have changed all the hoses, thinking maybe one was coming apart on the inside. Changed the water pump, even changed the heat exchangers thinking maybe there was something plugged up. I have had it in every position but upside down while filling it with coolant. The most successful thing I did was put a "T" in the upper hose (by the coolant cap) and hooked a garden hose to it and turned it on, this pressurized the system. Started it up and cracked the bleed screw on top of the head to force the air out. This worked awesome! To keep the anti-freeze level up before I did all this I put straight anti-freeze in before I hooked up the garden hose and when it was all said and done the level was still -40. With all that being said...... lol. It didn't over heat for several miles but it finally did it again. The system had air in it again? I've repeated this several times and it keeps getting air in it and I cannot figure it out. I had someone tell me it could be the coolant cap? So I have ordered that. That is the only thing I haven't replaced. It's starting to sound like the head gasket that someone mentioned in a previous post? It just runs so good I find that hard to believe? But don't know what else to do?
 
my sx will overheat if im not going thru good snow...even on hard packed trails!!!! You cannot tow anything with these sleds they will over heat!! if your running third window closed track it will overheat. the main heat exchangers are under the running boards ,so it needs snow to cool.I have never had an issue with air pockets with this sled...it should pretty much self prime after you crack the coolant bolt bleeder on the thermo housing....you probably have a bad head gasket!
 
I had the same problem with one of mine after I had it apart for water pump issues. Talked to local dealer and they said they had a special cap for bleeding that goes on and snaps but still lets air out but not coolant?!? Not sure how that would work but after fighting with mine forever I finally got fed up with it and took it for a ride after doing everything I could think of. Once again it overheated and I just got mad and grabbed a rag and loosened the cap while it was hot (just shut off with heat light on!) I got a bunch a coolant flying out, but better yet I got a bunch of air. Topped off the bottle and it has been fine ever since. Knock on wood! I was at my wits end and just tried this out of desperation and after a bunch of choice words and threats to part the son of a gun out. Maybe I just lucky, but it might be worth a shot.
 
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