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[LS1] Coolant drain plug

Discussion in 'LSx Development and Modification' started by H1GHROLLR, Apr 13, 2009.

  1. H1GHROLLR

    H1GHROLLR CHEMICALLY SUPERCHARGED

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    hi people does anyone know where the coolant drain plug is to drain the

    block on the ls1. . .just taking of the bottom hose wont empty the block

    will it??
     
  2. Lumps of cheese

    Lumps of cheese welcome to the machine

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    I just took off the heater hose and flushed it through with the garden hose until it was clear, that way you get it all out.
     
  3. H1GHROLLR

    H1GHROLLR CHEMICALLY SUPERCHARGED

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    which hose did you take off mate there are heaps of hoses where abouts is it
     
  4. Lumps of cheese

    Lumps of cheese welcome to the machine

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    The heater hose, on the right hand side of the motor. It's a 3/4" hose i think from memory. Doing that means you also get the extra coolant that will be in the heater too so that's why i do it that way.
     
  5. H1GHROLLR

    H1GHROLLR CHEMICALLY SUPERCHARGED

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    ok yeah and do you take the bottom radiator hose off too
     
  6. H1GHROLLR

    H1GHROLLR CHEMICALLY SUPERCHARGED

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    really want to find that drain plug in the block
     
  7. Lumps of cheese

    Lumps of cheese welcome to the machine

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    Certainly do. Flush when the bulk of the coolant is drained. Put the garden hose on the heater hose and flush, then reverse the flush by putting the garden hose on the block where you took the heater hose off.
     
  8. H1GHROLLR

    H1GHROLLR CHEMICALLY SUPERCHARGED

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    cheers mate
     
  9. Lumps of cheese

    Lumps of cheese welcome to the machine

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    I think the block plug is on the passenger side if you want to go that way, down the bottom half way along. I only go the other way to get all the coolant out of the heater. It can be a real bitch to get the air out of the system too once you replace the coolant.
     
  10. H1GHROLLR

    H1GHROLLR CHEMICALLY SUPERCHARGED

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    i have always just left the cap off and let it bubble
     
  11. Lumps of cheese

    Lumps of cheese welcome to the machine

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    Ahh yep, fair enough.
     
  12. H1GHROLLR

    H1GHROLLR CHEMICALLY SUPERCHARGED

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    pretty sure that works not too sure lol
     
  13. Lumps of cheese

    Lumps of cheese welcome to the machine

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    lol, as long as the sucker don't run hot then it works!
     
  14. cpbait

    cpbait New Member

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    i drained and refilled mine twice :D we'll first time was to drain the coolant and bleed the system up, then 2 weeks later when on holiday went for a day trip to bendigo and the water pump decided to leak, drove back to where staying, topped it up drove home a couple of days later topping it up on the way (only lost about 2 liters) then holden replaced the water pump and used new coolant again so it got a good flush :D also where is the plug on the block,heard a few people mention this, would be handy to know, as that was how we drained the cooling system on the 4 liter land rover discovery srz2 v8's, there's was on the left hand side of the block just below the left hand side extractors(about halfway along) and made it alot easier to drain the system completely. it was a square plug but 11mm socket with short extension and 3/8 ratchet fitted perfectly on to it.
     
  15. H1GHROLLR

    H1GHROLLR CHEMICALLY SUPERCHARGED

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    i dunno were it is but i really wana know
     
  16. cpbait

    cpbait New Member

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    yeh if you find out, let us know, thanks.
     
  17. DanVN

    DanVN Cruizin' in style!

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    From the net not sure on the accuracy tho, but might help
     
  18. commsirac

    commsirac Banned

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    Perhaps someone can confirm this for me, but both the v8 and v6 being american derived motors have imperial bolts etc?
    Do we need imperial or metric spanners?

    11mm and 7/16 in are within 0.004in of each other.
     
  19. cpbait

    cpbait New Member

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    either would be ok, whichever fits best, not sure if there that size as that was for the landrover discovery srz2 and rangerover v8's from 1999-2004/05 (4 liter v8).

    i'm not sure if they were american derived v8's, i know the 3.9 v8s before 1999 were buick v8's so may be simmilar.
     
  20. commsirac

    commsirac Banned

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    I was seeking to clarify whether one needs a set of imperial spanners/sockets or metric for these motors, not just for the coolant drain plug.
     

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