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Rifleman ***
Age: 64 Zodiac: Joined: 25 Jun 2016 Posts: 241 Location: Edinburgh, Bonnie Scotland.
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Posted: Tue Jan 30, 2018 23:53 Post subject: Bleeding the cooling system |
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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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Posted: Tue Jan 30, 2018 23:53 Post subject: Google Ads keep the POCUK free to join! |
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peteinchad LifeTime Member
Joined: 07 Jan 2013 Posts: 15079 Location: UK
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Posted: Wed Jan 31, 2018 5:34 Post subject: |
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Exactly what I do - never had an air lock on mine. |
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Whatithas *
Age: 24 Zodiac: Joined: 05 Jul 2020 Posts: 18 Location: Reno
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Posted: Thu Jul 30, 2020 7:07 Post subject: |
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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 LifeTime Member
Age: 61 Zodiac: Joined: 13 Feb 2009 Posts: 4016 Location: Rainham Village, Essex.
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Posted: Thu Jul 30, 2020 12:05 Post subject: |
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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 ********
Age: 64 Zodiac: Joined: 29 Jul 2009 Posts: 5077 Location: Wherever I Wander To -- Midlands
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Posted: Thu Nov 19, 2020 3:50 Post subject: |
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Similar Mark, I remove an auxiliary hose the the turbo and fill until it runs out of the housing. |
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JuneAmara Newbie
Age: 25 Zodiac: Joined: 05 Feb 2022 Posts: 1 Location: Brazil
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Posted: Sat Feb 05, 2022 16:05 Post subject: |
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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 *
Age: 33 Zodiac: Joined: 26 Apr 2022 Posts: 12 Location: London
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Posted: Thu Apr 28, 2022 14:01 Post subject: |
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well at least it sounds interesting, I will try it |
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Whatithas *
Age: 24 Zodiac: Joined: 05 Jul 2020 Posts: 18 Location: Reno
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Posted: Mon Dec 05, 2022 13:26 Post subject: |
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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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