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Old May 14th 2018, 09:35 AM   #1
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Proper coolant bleed/burp procedure?

Hi guys,

I know there's plenty of info on the forum about the procedure but there are also many different opinions and most of the times the subject changes towards what to use (water wetter, engine ice, honda, agip, etc)

I would like to know, straight to the point, what's the proper procedure to get all the air out of the system.

What I've read so far is top of the radiator, rock the bike back and forth or sideways. Run the bike to about 180F then let it cool down and refill radiator if necessary (squeeze the hoses to burp air out) then top off the reservoir/tank.

Now, my question is... am I missing anything? Is the radiator cap supposed to be on or not while squeezing the hoses and letting the bike run to about 180F? (I know it should NOT be there if letting it run all the way until the fan kicks on because it will splash out and burn the hell out of you)

Reason I ask is because I recently flushed my coolant about 3 times with distilled water then added the AGIP coolant recommended/used by my Ducati dealership. I did this because I had to replace the thermostat housing (squirter unit).

After I went for a ride and the temperature while sitting at a red light went up too much at one point (230F). While riding it will stay around 217F (Vegas, kinda hot already)

I came back home, parked the bike and waited until temp reached about 180F, removed the radiator cap and squeezed the hoses a little bit and topped off the radiator with distilled water (ran out of AGIP coolant). It took quite some water, so my guess is I had a big air pocket.

Went for another ride and the temperature while riding was about 212-214F and 221-225F while fully stopped (it lowered from my previous ride). But I sill think it's a little bit high and maybe I need to refill rad again and squeeze the hoses????

One curious thing I noticed while I was parked with bike idling after highway riding and the fan kicked in at 217F as it should, but couldn't drop the temp to 212, it went to 225F after a couple minutes and sat there forever without going up or down. THEN, I am like ok I'm gonna get off the bike and inspect for leaks or whatever and as soon as I put the kick stand down the temp drop to 221F instantly. It's some sort of freak electrical situation! So weird, every time I did it, it happened! But as soon as I took off the temp would go down to about 214-212 in a matter of a minute or so (it wasn't extremly hot outside plus it was kinda cloudy)

I think temp shouldn't go past 217-219F and once the fan kicks on it should drop to about 212 (that's when the fan shuts off). So, any ideas? Do I still have some air in the system? Am I not doing it right? Is my bike is F**#@ up, lol? is 225F still way too high for red light /idling and 214-217F while riding above 60mph? Is the AGIP coolant that comes in a bag a piece of crap?

Bike: 2013 1199 base/ABS - 15k miles

Thanks in advance! Cheers!

Last edited by rrgermanlv; May 14th 2018 at 11:43 AM.
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Old May 14th 2018, 11:32 AM   #2
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the heat in Vegas will keep your temps higher than 210 if you're not getting enough air thru the radiator

bleeding off that bubble would probably best be handled with a vacuum pump, but burping it works too....burping it is more certain to happen with tie straps to the ceiling and slowly tilt it as far as you care to go (cap off, cold or hot) while squeezing the hoses...

the few times i had a bubble, one time it cleared itself, the other time it got suspended from the ceiling and tilted over (cap off, cold, squeezed the hoses) & hoped for the best.....it worked

the stock coolant is good stuff.....if you use straight water, you'll need some sort of lubricant (water wetter) to keep your water pump and seals happy - but i'd check on that at the shop, given i'm talking from the days of the 916 and desmosedici....i don't think things have changed that much, but doesn't hurt to ask

running the temps up to 219/220 is a-okay...as long as the fans kick on all is well with the world...you're probably stuck in traffic (even a red light can do it) or in the middle of NYC/LasVegas
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Old May 14th 2018, 11:42 AM   #3
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Originally Posted by RD16RR View Post
the heat in Vegas will keep your temps higher than 210 if you're not getting enough air thru the radiator

bleeding off that bubble would probably best be handled with a vacuum pump, but burping it works too....burping it is more certain to happen with tie straps to the ceiling and slowly tilt it as far as you care to go (cap off, cold or hot) while squeezing the hoses...

the few times i had a bubble, one time it cleared itself, the other time it got suspended from the ceiling and tilted over (cap off, cold, squeezed the hoses) & hoped for the best.....it worked

the stock coolant is good stuff.....if you use straight water, you'll need some sort of lubricant (water wetter) to keep your water pump and seals happy - but i'd check on that at the shop, given i'm talking from the days of the 916 and desmosedici....i don't think things have changed that much, but doesn't hurt to ask

running the temps up to 219/220 is a-okay...as long as the fans kick on all is well with the world...you're probably stuck in traffic (even a red light can do it) or in the middle of NYC/LasVegas
Thanks for the reply. Can you be a little bit more specific regarding the vacuum pump procedure?
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Old May 14th 2018, 12:35 PM   #4
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Originally Posted by rrgermanlv View Post
Thanks for the reply. Can you be a little bit more specific regarding the vacuum pump procedure?
- the procedure itself is straight forward...YouTube is your friend

the issue will be finding the kit with the correct sized fittings

MightyVac
SnapOn
MacTools

one of those would be a good start

heres one with a lot of sizes:

https://www.amazon.com/dp/B07C4YSJ2Q...&pd_rd_w=EyaaQ
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Last edited by RD16RR; May 14th 2018 at 12:39 PM. Reason: added link
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Old May 14th 2018, 03:28 PM   #5
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Cap off like any other cooling system
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Old May 16th 2018, 04:20 PM   #6
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Originally Posted by Halo2 View Post
Cap off like any other cooling system
+1^^ And remember to blip the throttle when the thermostat opens. That should purge any air or cavitation from the pump
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bleed or burp, coolant, procedure, proper



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