coolant( pressure build up)?

7

700XT

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So I pulled my sled into the garage yesterday, and let it sit. today I went to take off the coolant cap and collant sprayed out. So I seem to be having pressure building up in my cooling hoses. the sled is a 98 xt700. I haven't had any overheating problems. Could a bad rad cap cause this, or maybe air trapped in the lines? or should I look elsewhere?

thanks
Shawn

Edit.. I did the head gasket mod and bleed the coolant, late last season. It did run fine afterwards. I did have trouble bleeding the system however. but It never overheated. I haven't ridin the sled much yet this year, maybe 10 miles. but no problems.
 
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shouldn't have that much pres., are you getting coolant transfer to the
res. bottle when warmed up running it?
 
I haven't had a chance to really check it out. I'll get it running tomorrow, and report back. the coolant bottle is at the full line now(not run it since yesterday). could it just be over filled?
thanks
Shawn
 
Unless there was a lot of coolant released when you uncorked the cap, then I wouldn't worry too much about it. It happens just about every time I have done it to my sleds, I would keep an eye on the overflow reservoir and if the level changes much one way or the other then I would be concerned. I am talking excess of more than an ounce of so.
 
Weatherbyman said:
Coolant over filling the expansion bottle and not returning to a cold engine is usually the sign of a head gasket failure.
Click to expand...
I did do the head gasket mod, towards the end of last season. I did run it probably 3 or 4 weekends after the mod and all seemed ok. ran pretty good. Are there any obvious signs of a bad head gasket. I don't think i'm losing coolant, besides whats spraying out when I open the coolant cap. I'm not sure if it sprayed out last year when I took the cap off or not. I could just be making up a problem when there isn't one. the hoses are soft when you sqeeze them, they are not hard at all.

anyone else spray coolant when you open the radiator cap?

thanks all!
Shawn
 
Weatherbyman said:
Coolant over filling the expansion bottle and not returning to a cold engine is usually the sign of a head gasket failure.
Click to expand...
He said he had no over heat issue, a blown hg would over heat i a heart beat,plus he'd know what pres. is then.

700XT check your plugs. look down in the cyl. with a pen light does it look
clean on top of the pistons?
 
Unless I am misunderstanding what you are saying it is normal to build pressure. By putting coolant under pressure it raises the boiling point. That is why they have radiator caps that hold pressure. As coolant warms up, even a little it expands and puts pressure on the cap. The hotter it is the more pressure. When it cools it contracts and pulls the excess out of the overflow tank.
 
Yea but he's saying sitting over night it still has lots of pressure in the system, i don't beleive mine do that IIC..
 
yes sitting over night, there is still pressure. Is that normal? I'm used to vehicles, when they cool there is no pressure. I know that when its hot it expands. however this is after sitting for a day. I didn't get a chance to run it today. but will tommorow. I will watch the overflow bottle and see what happens. then I'll report back. thanks to all!

Shawn
 
gasket

A leaking head gasket will not necessarily overheat immediately. I've seen it many times. The leak pressurizes the cooling system. You will eventually lose coolant out the overflow. A loss of coolant will obviously cause an oveheating condition. The Vmax fours suffered from this affliction. I'm willing to bet this is the problem.
 
Weatherbyman said:
A leaking head gasket will not necessarily overheat immediately. I've seen it many times.
Click to expand...
Well i lived it once and so did a bud on a poo, too much pressure in the
system coolant can't circulate.

this was on a severe failure...
 
I just put a longtrack on the wife's SXR and had the red off . When I had it all topped off I ran the sled for a good while checking the heat exchangers to see if they are getting warm. The checked out fine, bleed the air out a few times and one I even had the rad cap off while it was running to see if it was circulating and it looked like it was but hard to tell when it was vibrating. Long story short after it sat for a few days I took the rad cap off to see if it went down anymore and there was still pressure there and spilled out maybe a couple of ounces at most. I think my Polaris does the same thing. I never got a temp light after 10 minutes of idling in the garage
 
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