P1000m5 Pioneer 1000-5 can’t get air out of coolant system

[Chamby1000-5]

Got a 16’ pioneer 1000-5 that constantly overheats. Tried to burp multiple times to no avail. When it overheats radiator is 85 degrees and coolant coming out is 85-90 degrees, so I assume it’s getting air pockets. When trying to burp it constantly bubbles and occasionally blows out the top, but even after it does and I fill the rad back it never stops it just continues the cycle. Will idle all day and never see three bars, and also never see three bars when staying around 4500 rpm but seems to get air pockets when you really get on it. At a loss here any help would be greatly appreciated, thanks


Sent from my iPhone using Tapatalk

 

[Admin]

 

[0860silverado]

Got a 16’ pioneer 1000-5 that constantly overheats. Tried to burp multiple times to no avail. When it overheats radiator is 85 degrees and coolant coming out is 85-90 degrees, so I assume it’s getting air pockets. When trying to burp it constantly bubbles and occasionally blows out the top, but even after it does and I fill the rad back it never stops it just continues the cycle. Will idle all day and never see three bars, and also never see three bars when staying around 4500 rpm but seems to get air pockets when you really get on it. At a loss here any help would be greatly appreciated, thanks


Sent from my iPhone using Tapatalk

Did you bleed the bleeder screw at the top of the thermostat housing?

 

[Chamby1000-5]

Did you bleed the bleeder screw at the top of the thermostat housing?

Yes I have, even took out the thermostat to make sure it all circulated


Sent from my iPhone using Tapatalk

 

[Remington]

Yes I have, even took out the thermostat to make sure it all circulated

How did u burp it?
also, are u burping it to try and help the overheating or are u burping it cuz u changed the fluid or both? If u didnt already know, u need to elevate the front end to properly burp it. A quick search up top as always, gave me a nice link and another link there form the great Sunuffwhisky. Report back if this works.

Burping

My '18 P1K ran hot a couple of times in past 2 yrs. The last day a Mulberry it became much worse. Thanks @joeymt33 and @snuffnwhisky on the detailed instructions on burping the beast. I got her done today, but now I am nearly 100% water in it, and will need to drain half of it out to add...

hondasxs.com

 

[Chamby1000-5]

How did u burp it?
also, are u burping it to try and help the overheating or are u burping it cuz u changed the fluid or both? If u didnt already know, u need to elevate the front end to properly burp it. A quick search up top as always, gave me a nice link and another link there form the great Sunuffwhisky. Report back if this works.

Burping

My '18 P1K ran hot a couple of times in past 2 yrs. The last day a Mulberry it became much worse. Thanks @joeymt33 and @snuffnwhisky on the detailed instructions on burping the beast. I got her done today, but now I am nearly 100% water in it, and will need to drain half of it out to add...

hondasxs.com

Burping to try to stop overheating, I have elevated front while burping to no avail. Read multiple threads on overheating problem but haven’t found anyone who is having the same problem as me, every other case where someone has air in the system their pioneer gradually overheats. Mine is perfectly fine the all of a sudden hits three bars then 4 bars within 30 seconds. When this is going on motor will be 200+ degrees while radiator is

Sent from my iPhone using Tapatalk

 

[JenElio]

Burping to try to stop overheating, I have elevated front while burping to no avail. Read multiple threads on overheating problem but haven’t found anyone who is having the same problem as me, every other case where someone has air in the system their pioneer gradually overheats. Mine is perfectly fine the all of a sudden hits three bars then 4 bars within 30 seconds. When this is going on motor will be 200+ degrees while radiator is

Sent from my iPhone using Tapatalk

That's weird for sure.

Have you tried replacing the radiator cap? Sometimes they'll go bad (seal)

Also, maybe....... While burping it, after it spews out some, put the cap back on for a while, then burp it again?? 🤷‍♂️ let it circulate a bit under pressure before letting some more air out, maybe worth a shot??

 

[JMynes]

Maybe the thermostat is not opening.

 

[WagginTail]

Maybe the thermostat is not opening.

What I was thinking myself

 

[DRZRon1]

sounds maddening......

any history on motor, swamped, rebuilt, etc.?

do you have a heater installed?

assuming no leaks on the floor

no oil in coolant, no coolant in oil?

suggestions

-pressure check coolant system

-pressure check and inspect overflow tank/hose

 

[Robobrainiac]

Just some bad news, technically if you are burping it properly as mentioned above using elevation and multiple attempts fail leaving you with continued air in the system then you may have a blown head gasket pushing combustion gasses into the coolant system.

 

[Chamby1000-5]

Just some bad news, technically if you are burping it properly as mentioned above using elevation and multiple attempts fail leaving you with continued air in the system then you may have a blown head gasket pushing combustion gasses into the coolant system.

I’ve considered this but haven’t heard of it happening to any other pioneer and I feel like if I did torch the gasket it would pressurize the system at all times and not just randomly, and the complete system isn’t pressurized, when it overheats you can take the rad cap off and it dosent spew out untill you crank it up, then it will blow out and instantly cool down


Sent from my iPhone using Tapatalk

 

[Chamby1000-5]

sounds maddening......

any history on motor, swamped, rebuilt, etc.?

do you have a heater installed?

assuming no leaks on the floor

no oil in coolant, no coolant in oil?

suggestions

-pressure check coolant system

-pressure check and inspect overflow tank/hose

Yeah really stumped talked to about 20 dealers just to see if they have had one with similar problems or one that has lifted the head but not a single one has had anything like it. I’m going to pressure test it when I get time, but the entire system is not pressurized, when this happens and it overheats I can take the rad cap off and it doesn’t blow coolant out until I crank it up, so the radiator itself isn’t pressurized. That’s what is baffling me if the entire system would be pressurized I would have a good idea, or if it did all the time but it will idle all day with no problems. I’ve drove 20+miles then worked the s*** out of it pulling trees and didn’t move over two bars then all of sudden while just easing thru a trail it jumps from 2 bars to 4 and I take the cap off crank it over and it’s right back to 2 bars. Blows my mind


Sent from my iPhone using Tapatalk

 

[Chamby1000-5]

Maybe the thermostat is not opening.

Thought it might be a problem as well so took it completely out to no avail, still overheats and it not from water circulating to fast, as I have mentioned when this happens the motor will be 200 us degrees and the radiator be 80 degrees at the inlet. One of the first things I tried after burping didn’t work, also because it has a lower temp thermostat than stock thought it might have issues but didn’t change anything other than water constantly flows now


Sent from my iPhone using Tapatalk

 

[Chamby1000-5]

That's weird for sure.

Have you tried replacing the radiator cap? Sometimes they'll go bad (seal)

Also, maybe....... While burping it, after it spews out some, put the cap back on for a while, then burp it again?? let it circulate a bit under pressure before letting some more air out, maybe worth a shot??

Thought I might replace cap but was thinking if the seal went bad then it would vent all the time and not allow the system to pressurize at all and also since the entire system isn’t pressurized didn’t think it was the issue


Sent from my iPhone using Tapatalk

 

[Chamby1000-5]

What I was thinking myself

No thermostat and problem still occurs thought this was the culprit myself


Sent from my iPhone using Tapatalk

 

[bigshoe]

Try a coolant vacuum, I don't mess around trying to burp any more. 5 min and done with vacuum. the tool sucks air out replaces it with coolant. also it will tell u if u have a leak or head gasket blown it won't pull any vacuum if there's a leak

 

[JMynes]

Failed water pump?

 

[Chamby1000-5]

Try a coolant vacuum, I don't mess around trying to burp any more. 5 min and done with vacuum. the tool sucks air out replaces it with coolant. also it will tell u if u have a leak or head gasket blown it won't pull any vacuum if there's a leak

10–4 I’ll look into picking one up. thanks


Sent from my iPhone using Tapatalk

 

[Chamby1000-5]

Failed water pump?

It flows fine at all times except when overheating, but as soon as you take rad cap off it flows just fine so unless it can intermittently work I think the water pump is okay. Like I’ve said it will idle all day and ride for a long time before this happens. Plenty of time for it to overheat if it was not flowing


Sent from my iPhone using Tapatalk

 

[0860silverado]

Is your radiator fan running when it overheats? May be an intermittent fan problem. I've heard of this happening and a computer reflash seems to solve it. Or possibly the fan relay going bad and working intermittently.