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Coolant drain on 1kz engine block

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  • Coolant drain on 1kz engine block

    Whilst working through my 200K service I'm up to coolant replacement and I've looked and googled but cannot find a second coolant drain on the engine block for my 1kz-te prado. I would give up and say there is only one but I'm constantly draining only 7 litres of coolant from the tap on the radiator and the block but the manual says I should be replacing 12.2 litres (which seems a lot).

    To start with I found the radiator drain valve had snapped off so I had to hacksaw a cut across the plastic and undo it with a screw driver. Next I found this coolant drain below the oil cooler on the side of the engine block. I placed a bit of tube over the little spout to direct the stream better and then undid the nearby bolt to let it flow.



    Took care to add some volume indicators on the container catching the fluid.



    But now I don't want to put 7 litres (of expensive Toyota coolant) back if there is a third coolant drain I need to find. Any help would be much appreciated.
    ------------------------------------------------------------------------------------------------------
    2003 GX TD Prado, 245 Cooper ST, Bilstein + Ridepro suspension, Icom 4400 UHF, Dig Options Sat Nav, ARB Alloy rack, Foxwing awning, 2012 Tvan Marranji Camper Trailer.

  • #2
    Re: Coolant drain on 1kz engine block

    Remember the heater core will hold fluid and can't be drained (as far as I know without removing it) My method is the same as you have done but, I refil the system with demineralised water and run the engine until hot to dilute whats left in the system and drain as per your post. If there is any signs of coolant I refill and run again. I do have a heat exchanger for my under bonnet shower as well thats the reason I flush repeatedly. Once I'm happy its a matter of putting the good stuff back in, run it and check the coolant level. This is an annual event for me ie 12 months.
    Nick

    2004 TD GXL ARB bar, warne winch, safari snorkle, front+rear diff locks, under bonnet shower, diff breathers, lightforce HID's, supernova HID's, roof top tent, awning, custom drawers, DVD headrests, TP09X1, list goes on

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    • #3
      Re: Coolant drain on 1kz engine block

      Thanks Nika, I suppose if there's four litres in the heater and another litre goes into the overflow that's getting to my 12 litres the manual specifies. I'll clear the coolant the way I've been doing it and then run the engine up to temp and see if I get more coolant tint coming through.

      Cheers.
      ------------------------------------------------------------------------------------------------------
      2003 GX TD Prado, 245 Cooper ST, Bilstein + Ridepro suspension, Icom 4400 UHF, Dig Options Sat Nav, ARB Alloy rack, Foxwing awning, 2012 Tvan Marranji Camper Trailer.

      Comment


      • #4
        Re: Coolant drain on 1kz engine block

        OK, so I flushed the system until only clear water ran through. I then added demineralised water only until full again and ran the engine up to temp. I figured if there was coolant tint to the next flush then there was a store of coolant in the heater element that was not being cleaned out by the flushing and sure enough after the engine was run for a while the next flush had more coolant tint to it. Assuming that the manual was correct and there was 12.2 litres of capacity for engine coolant I added 6 litres of coolant to the system (engine and overflow) and topped-up with more demineralised water which should give me the 50/50 mix recommended.

        Bit of a drawn-out process but should be much easier to do next time.
        ------------------------------------------------------------------------------------------------------
        2003 GX TD Prado, 245 Cooper ST, Bilstein + Ridepro suspension, Icom 4400 UHF, Dig Options Sat Nav, ARB Alloy rack, Foxwing awning, 2012 Tvan Marranji Camper Trailer.

        Comment


        • #5
          Re: Coolant drain on 1kz engine block

          Originally posted by nika
          Remember the heater core will hold fluid and can't be drained (as far as I know without removing it) My method is the same as you have done but, I refil the system with demineralised water and run the engine until hot to dilute whats left in the system and drain as per your post. If there is any signs of coolant I refill and run again. I do have a heat exchanger for my under bonnet shower as well thats the reason I flush repeatedly. Once I'm happy its a matter of putting the good stuff back in, run it and check the coolant level. This is an annual event for me ie 12 months.
          most radiator places drain the block and radiator then flush also they disconnect the heater the flush it as well , then they use a compressor to blow the water that is still in the heater core , then and only then do they refill , the people i use said that it was to make sure that all coolant was out before adding the new stuff , if you dont most coolants arent compatible and only eat your radiator, thats what happened to mine so i had them build a custom 1 to suit , total cost including a transmission cooler was $900 for full alloy radiator fitted , heaps better than $1200 -$1300 for one with plastic tanks

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          • #6
            Re: Coolant drain on 1kz engine block

            well thats is a good out come mate, in relation to my post, it was written to make sure that people that read it and dont know as much as me can do the job without having problems with mixing coolants, yes it is a pain doing it that way but opening hoses to blow out with air just introduces a possible leak disturbing perfectly good seals on hoses. Each to their own I guess, and I'm sure others have different ways of doing it hence this great forum, it's a wealth of knowledge, any new ideas are always welcome.
            Nick

            2004 TD GXL ARB bar, warne winch, safari snorkle, front+rear diff locks, under bonnet shower, diff breathers, lightforce HID's, supernova HID's, roof top tent, awning, custom drawers, DVD headrests, TP09X1, list goes on

            Comment


            • #7
              Originally posted by mcgonical View Post
              Whilst working through my 200K service I'm up to coolant replacement and I've looked and googled but cannot find a second coolant drain on the engine block for my 1kz-te prado. I would give up and say there is only one but I'm constantly draining only 7 litres of coolant from the tap on the radiator and the block but the manual says I should be replacing 12.2 litres (which seems a lot).

              To start with I found the radiator drain valve had snapped off so I had to hacksaw a cut across the plastic and undo it with a screw driver. Next I found this coolant drain below the oil cooler on the side of the engine block. I placed a bit of tube over the little spout to direct the stream better and then undid the nearby bolt to let it flow.
              Sadly, mcgonical's photo wasn't sufficient for a "boy's look" for the block drain valve, so I went to a Toyota dealer and asked them to point it out to me. It was a real "duh" moment. But just in case other's are similarly challenged in spotting the bleedin' obvious, I've included this photo which shows it in a larger scale.

              Click image for larger version

Name:	block coolant drain (Large).JPG
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ID:	752417

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