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Bleeding the cooling system


 
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Rifleman
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Age: 64
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Location: Edinburgh, Bonnie Scotland.

PostPosted: Tue Jan 30, 2018 23:53    Post subject: Bleeding the cooling system Reply with quote

Having been a mechanic since I was 16, (now 58) I have been amazed at the way people have difficulties in bleeding their cooling systems after work done or changing antifreeze.
Some really extreme tips come up now and again too.
In all my years, I have never ever had a problem bleeding a cooling system and have only ever used one method, after being shown this as an apprentice years ago. Even on modern vehicles, its a proven method.
Here is how I carry this out.

With an empty system, set the heater controls to windscreen, hot, and the fan to 1 or 2. (No faster or you will simply remove warm air and stop heating up}
Start the engine and allow to idle.
SLOWLY add the correct amount of antifreeze.  (Adding slowly stops air being trapped. )
Then SLOWLY add clean water until you reach the correct level.
Leave the cap OFF and allow the engine to reach its normal running temperature and the heater is blowing hot air onto the windscreen.
(You may need to top up as the level goes down when the thermostat opens) so keep an eye on this as if the level drops too much, you may allow air in.

DO NOT BE TEMPTED TO REV THE ENGINE OR YOU WILL CAUSE TRAPPED AIR

Once the heater is hot and the coolant in the expansion bottle is hot and at the correct level, replace the cap to seal the system.
Allow the engine to tick over for another 5 minutes or so to make sure there is no overheating or other problems occuring.
Job done.
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peteinchad
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Joined: 07 Jan 2013
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PostPosted: Wed Jan 31, 2018 5:34    Post subject: Reply with quote

Exactly what I do - never had an air lock on mine.
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Whatithas
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Age: 24
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Location: Reno

PostPosted: Thu Jul 30, 2020 7:07    Post subject: Reply with quote

You have give tips on cooling system which will help my home cooling system to upgrade it to work longer.
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Mark3
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PostPosted: Thu Jul 30, 2020 12:05    Post subject: Reply with quote

For vehicles with a thermostat positioned in the lower hose, flow to engine from rad, i remove the top hose and filled the engine though it, replace the hose, top up the rad and thats it., never had a problem.... heater control position on a Pajero (mk2) makes no difference to the flow of coolant as the matrix has no flow valves and is always open to the flow of coolant....
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assassin
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PostPosted: Thu Nov 19, 2020 3:50    Post subject: Reply with quote

Similar Mark, I remove an auxiliary hose the the turbo and fill until it runs out of the housing.
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JuneAmara
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PostPosted: Sat Feb 05, 2022 16:05    Post subject: Reply with quote

assassin wrote:
Similar Mark, I remove an auxiliary hose the the turbo and fill until it runs out of the housing.

The best and simpler solution
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Authority924
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PostPosted: Thu Apr 28, 2022 14:01    Post subject: Reply with quote

well at least it sounds interesting, I will try it
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Whatithas
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PostPosted: Mon Dec 05, 2022 13:26    Post subject: Reply with quote

Typically, the bleeding screw is situated near the top of the engine. The location where the upper is most frequently found is directly on the thermostat housing.  Visit This Site
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