Bleeding cooling system

Discussion in 'LR4' started by Jeffry Johnson, Feb 3, 2019.

  1. scott schmerge

    scott schmerge Full Access Member

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    If your bleed screw breaks, don’t panic. Advance auto parts has two of them for $4. If it’s me, I’d go ahead and replace them as insurance.
     
    Last edited: Feb 8, 2019
  2. scott schmerge

    scott schmerge Full Access Member

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    One more thought...are you letting the truck heat up and then shutting it down and opening all bleed valves and expansion tank cap? This will allow coolant to settle and air pockets to rise. After letting it sit for hours, check and refill expansion tank as needed. My guess is the vacuum, with everything tight, is not allowing air pockets to rise and coolant to drain into the system from the expansion tank. If you see a drop in level after the first cycle, repeat once or twice more. Lots of places for air to hide in the cooling system on these trucks...
     
  3. Jeffry Johnson

    Jeffry Johnson Member

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    thanks for that. that's a good thought. I did think about something like that but I always thought air would suck back into the system .now when I started up on high idle I'll have heat but as soon as it drops down to regular idle it cools back down.really appreciate all your help Rover Owners.
     
  4. scott schmerge

    scott schmerge Full Access Member

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    If you think of the bleed valves as the high points, the water doesnt drop back down unless there is air in the system or a leak. You’ve ruled out a leak with the pressure test. Opening the valves on cool down only serves to allow air to escape and water to be drawn into the system.
     

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