Coolant Overflowing...

jobenshain said:

There is coolant coming out of the cap to my coolant overflow(?) bottle.
Any ideas why this would happen? The engine does not over heat...but the coolant is coming out the little hole in the cap.

Any suggestions are appreciated.

Thanks.

Click to expand...

jason, if it is spewing out the overflow cap, you are definantely overheating. You may just have a bad radiator cap as that will let the coolant blow by it on the way to the recovery bottle at a lower temp.

Thanks for responding Kris.
I was hoping it was the radiator cap...i actually replaced it yesterday.

but it is still happening...

I read your thread with 312inch...discussing a similar topic. So I will go through some of the steps listed...

How full is your overflow tank? When I check mine every couple months, the reserve tank is always empty, and if I fill the radiator, and fill the reserve tank half full it'll push out some coolant when I take it for a drive and get it heated up good. As long as your radiator stays full of water and you're not overheating, it's fine.

Never had a ranger that could keep coolant in the reserve tank. don't know if it's the bumpy riding that pukes it all out the hole in the top cap, or if it's a leak somewhere I've never been able to find, but it's kinda the nature of the beast.

its funny you mentioned that...i used it this morning plowing snow for a couple of hours. no over flow.
then i noticed the bottle was empty...so i filled it. then took the ranger out for a spin...and it started.
maybe it was too full?

if you filled it all the way up or mostly up, it's too full.

I think it's supposed to be around half full with the engine full hot.

Like I said, if the radiator is full of coolant, and it's not overheating, the overflow tank doesn't mean much. it's there only to catch the little bit of extra water that would otherwise be expelled from the radiator when the engine is fully hot or being run hard. (water in the cooling system expands when hot)...

Glad to see ya got it figured out!

Thanks! I appreciate the feedback.

So i ended taking it into the dealer this week. Travel for work didn't leave enough time to continue messing with it.
Turns out there was air in the system.
$69.00 later...problem solved.

Does anyone here know the normal operating temperatures of a 570 EPS Crew? Mine is running 185-205 in 20 degree temperatures and that's taking it pretty easy during break-in. I don't have my manual and just wanted to know. Also, the coolant fan is kicking on when I stop, even in when the outside temperature is in the teens. Seems a little weird, but no lights on the dash or anything else that seems it's a problem.

Johnny, even here in Colorado when it's close to 0° F it is normal in the winter for a truck to need air flow over the radiator to enable cooling. A radiator can only radiate so much heat when there is no airflow. So it doesn't surprise me in the least for the fan to come on in my Ranger when I'm not moving.

jobenshain said:

There is coolant coming out of the cap to my coolant overflow(?) bottle.
Any ideas why this would happen? The engine does not over heat...but the coolant is coming out the little hole in the cap.

Any suggestions are appreciated.

Thanks.

Click to expand...

It happened to me. I found out my thermistor was somehow getting ripped out off my engine. The metal part of my thermistor was inside the engine and the sensing part was ripped half way out. My rzr thought the engine was too cool to turn the fan on. The engine was not cool and caused antifreeze to spit out of my overflow. Check your thermistor!!! I probably got pretty close to blowing my head gasket.