airlock in coolant system

airlock in coolant system

Post by Michael Houlde » Fri, 04 Oct 1996 04:00:00


When we asked the local dealer about changing the engine coolant in a
liquid cooled machine, the dealer said that we really ought to let a
qualified mechanic do the job.  His reasoning was that an airlock or an
air bubble can be created in the coolant system, causing massive damage
later when running the sled.  This makes no sense to me what-so-ever!  
If anyone has ever heard of this, please speak up.  If this is indeed
true, how does one deal with the airlock?  

The machines in question are Arctic Cat's 550 and 580.

thanks
michael
ps, our lakes have started freezing!!

 
 
 

airlock in coolant system

Post by chri » Sat, 05 Oct 1996 04:00:00

A car will do the same thing, but run in till it warms up and with the
cap off till the thermostat opens up and it will run the air out of it
self, just keep adding water..Be sure to add the coolant very slowly  or
use hot water..I would think that to work..

 
 
 

airlock in coolant system

Post by Robert Rone » Sat, 05 Oct 1996 04:00:00

Don't put water in your coolant. There is a proper mix of coolant and water you
should use. I think it's a 60/40 ratio. Most sleds have bleed off's that are used to
get the air out of your cooling system. Check it out in a maintenance manual or look
your sled over. They are generally found on the engine and at the far extreme end of
you heat exchangers.

Sometimes you have to either raise the front of the sled and bleed off the air or
raise the rear and bleed off the air thru the end of the exchangers. The basic way
to do it is to start up the engine let it run at idle, take off the coolant cap, as
already suggested, and you will see the air bubbles ocurr while it runs. Stop the
engine. Add coolant and repeat exersize til line is full.

Not all sleds have bleeders as mentioned.

regards,

Bob

 
 
 

airlock in coolant system

Post by Michael Ha » Sat, 05 Oct 1996 04:00:00

: Sometimes you have to either raise the front of the sled and bleed off the air or
: raise the rear and bleed off the air thru the end of the exchangers. The basic way
: to do it is to start up the engine let it run at idle, take off the coolant cap, as
: already suggested, and you will see the air bubbles ocurr while it runs. Stop the
: engine. Add coolant and repeat exersize til line is full.

: Not all sleds have bleeders as mentioned.

Cat calls out using a non-pressurized cap. Now let's see how many ways we
could modify a standard cap to be non-pressurized...

clip spring..
Drill hole..
anymore?

Michael

 
 
 

airlock in coolant system

Post by Scott Will » Tue, 08 Oct 1996 04:00:00

Quote:

>When we asked the local dealer about changing the engine coolant in a
>liquid cooled machine, the dealer said that we really ought to let a
>qualified mechanic do the job.  His reasoning was that an airlock or an
>air bubble can be created in the coolant system, causing massive damage
>later when running the sled.  This makes no sense to me what-so-ever!  
>If anyone has ever heard of this, please speak up.  If this is indeed
>true, how does one deal with the airlock?  

        This is very true, Michael, be careful.  I overheated my Zirt when
running it for the first time after replacing the coolant when I
removed my heat exchanger to machine it to fit the 2" track.  I
realize that this makes no sense to you, and I had a hard time with it
myself at first.  But it's true.  I just use my engine hoist to pick
up the sled's front end by the bumper and raise it way high in the air
and I leave it like this overnight to allow the bubbles to come out of
the rear heat exchanger and hoses/tubing.  

Scott.

------------------------------------------------

'96  ZRT600  Mountain cat  2" track
http://www.vii.com/~scott/
------------------------------------------------

 
 
 

airlock in coolant system

Post by Doug Mill » Wed, 09 Oct 1996 04:00:00

Quote:

>Cat calls out using a non-pressurized cap. Now let's see how many ways we
>could modify a standard cap to be non-pressurized...

Are you sure? I thought my radiator cap was pressurized...
-Doug
 
 
 

airlock in coolant system

Post by Michael Ha » Sun, 13 Oct 1996 04:00:00



Quote:

>>Cat calls out using a non-pressurized cap. Now let's see how many ways we
>>could modify a standard cap to be non-pressurized...

>Are you sure? I thought my radiator cap was pressurized...
>-Doug

If you mean the stock cap...

Yes it is... the non-pressurized is used only to bleed the system of
air. For sleds with pressurized tanks it's probably not a big deal,
but for those with the cap mounted on a hose it would be.

Michael

 
 
 

airlock in coolant system

Post by Jetra » Sun, 20 Oct 1996 04:00:00

When you bleed the air out of the systems you my need more than the
cap.Depending on the model and the location of the heat exchangers you may
have to lift up certain areas of the sled. Some of the harder ones to
bleed are those exchangers in the nose. To tell if you have done a good
job, feel all of your exchangers after running the machine, if they are
cold you need to get the air out.