general question about burping cooling system

[SpencerA]

Raised front end way up ran motor. Coolers were warm so getting flow. My question is it ok to take reservoir cap off and pop release valve on radiator to get the air out? I was trying to avoid taking cap off so i didn't spill coolant all over when i ran motor.

 

[LoudHandle]

It likely varies some from make and model, but just did this myself a few hours ago. I had drained enough out to swap heads. Filled reservoir to the top, opened bleed screw on head until fluid came out, closed bleed screw, refilled reservoir, put cap on, ran it for 30 seconds or so. Opened reservoir and refilled, opened bleed screw until fluid again came out, closed bleed screw, refilled reservoir, install cap and run again for 30 seconds. Opened reservoir and refilled, opened bleed screw until fluid again came out, closed bleed screw, refilled reservoir, install cap and run again this time running it down a short hill banked to the right and back up the hill to flush the air out of the "u" coolers. Opened reservoir and refilled, opened bleed screw until fluid again came out, closed bleed screw, refilled reservoir, install cap and run again this time running it down a short hill banked to the right and back up the hill to flush the air out of the "u" coolers. Repeat until you see no drop in fluid in the reservoir.

Hope this was helpful, if you are not adding fluid to replace the air you are releasing your really not doing any good.

 

[SpencerA]

It likely varies some from make and model, but just did this myself a few hours ago. I had drained enough out to swap heads. Filled reservoir to the top, opened bleed screw on head until fluid came out, closed bleed screw, refilled reservoir, put cap on, ran it for 30 seconds or so. Opened reservoir and refilled, opened bleed screw until fluid again came out, closed bleed screw, refilled reservoir, install cap and run again for 30 seconds. Opened reservoir and refilled, opened bleed screw until fluid again came out, closed bleed screw, refilled reservoir, install cap and run again this time running it down a short hill banked to the right and back up the hill to flush the air out of the "u" coolers. Opened reservoir and refilled, opened bleed screw until fluid again came out, closed bleed screw, refilled reservoir, install cap and run again this time running it down a short hill banked to the right and back up the hill to flush the air out of the "u" coolers. Repeat until you see no drop in fluid in the reservoir.

Hope this was helpful, if you are not adding fluid to replace the air you are releasing your really not doing any good.

I don't have a bleed screw on my sled?

 

[LoudHandle]

I'm more familure with Polaris's, they all have a bleed screw right on the elbow above the thermostat, as it is a high point that traps air. Your sled may require a slightly different technique. Essentially though should be similar.

 

[SpencerA]

I'm more familure with Polaris's, they all have a bleed screw right on the elbow above the thermostat, as it is a high point that traps air. Your sled may require a slightly different technique. Essentially though should be similar.[/QUOTEso basically what I'm doing is the same thing as a bleed screw. Since I don't have one I use my radiator pressure release to get the air out. In theory should that work just as well or do I need to pop the radiator cap off since its the highest point? The reason I ask is because i'm still seeing bubbles after a lot of running time. Coolant is not dropping and is always topped off when i open cap. Is it common to take a very very very long time to get the air out?

Last question what symptoms would I start to see after riding for awhile with some air still in system? Would it cause cooling system to run warmer over a period of time?

 

[up-high]

If you still have air in the system, the motor will overheat. Air block doesn't allow the coolant to flow. What sled?

 

[SpencerA]

If you still have air in the system, the motor will overheat. Air block doesn't allow the coolant to flow. What sled?

So i rode awhile with low water temp.
ast run the water temp went up to 180 from 140s previous. Is this scenario possible with air in system?

 

[Himark]

"I rode for a while?"

Whats a while? You need to ride it for long enough to get hot. If you rode for 1/2 hours and seen temps like that no problems. If you have air in system you will get hot quickly.

Sounds like you are fine.


BTW, I always use a air lift to evac and fill systems. You never need to second guess again.

 

[SpencerA]

"I rode for a while?"

Whats a while? You need to ride it for long enough to get hot. If you rode for 1/2 hours and seen temps like that no problems. If you have air in system you will get hot quickly.

Sounds like you are fine.


BTW, I always use a air lift to evac and fill systems. You never need to second guess again.

Which model did you get? Is it pretty easy to use? This sounds like it would ease my mind a lot.