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  • 1KD-FTV coolant flush

    Hi guys, I'm going to do a coolant flush on my 150 series diesel prado. I've read other threads about it, like this one with attached diagrams. I just want to confirm I've properly located the engine coolant drain cock because it's hard enough to reach in there and I don't want to remove the wrong nut! See picture taken through the left wheel arch Click image for larger version

Name:	Inkedengine coolant drain cock_LI.jpg
Views:	1
Size:	81.3 KB
ID:	662579, I've circled what I think is the drain plug in red and it looks like the coolant will actually come out the green circled attachment. Is this correct?

    Also, are there any comments on my procedure:
    1. Add Nulon radiator flush to coolant reservoir and drive around for 20 min. with heater on hot
    2. Open radiator drain plug
    3. Open engine drain plug
    4. After all coolant has been drained, put both plugs back in place
    5. Refill distilled water into coolant reservoir and run engine for ~ 10min to circulate, then repeat steps 2 - 4. Now the system should be clean and empty.
    6. Refill with concentrated coolant & distilled water to required level

  • #2
    I wouldn't flush the system because you wont't be able to get all of the flush out. Just drain the coolant and refill with genuine so you don't have to worry about mixing coolant types.
    2019 GXL, Bullbar, UHF, Redarc Brake Controller, Tow Bar, Secondary Fuel Filter

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    • #3
      The drain in your photo is for he oil cooler and block. The main drain is at the bottom of the radiator.
      2019 GXL, Bullbar, UHF, Redarc Brake Controller, Tow Bar, Secondary Fuel Filter

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      • #4
        If you want to do it properly, (as in get most of the old stuff out) then you have to drain the block as well and yes the red circled one is the block drain plug. Drain the radiator from the drain plug on bottom of radiator and then drain the block.

        I personally wouldn't flush it but that's up to you. Just use genuine long life and no issues of mixing types that way. Also, once it's been drained it takes forever to fully fill it.
        You need to fill it up, run it till it's hot, top it up again, run the car around the block, top it up, run it down the highway, top it up and then it should be ok. Just keep an eye on the level for a few days and top up if necessary and then it should be fine.

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        • #5
          Thanks for your replies guys. Yes, I'm starting to feel like I should have just paid a bit extra for genuine coolant but I bought the nulon concentrated coolant and heaps of distilled water already so I'm commited now

          The coolant I have should be compatible with the Toyota one and not cause any nasty chemical reactions, I think. My understanding is that the main risk would be reduced effectiveness of the coolant if mixed with a compatible but slightly different one. Of course I'll be monitoring the thermostat closesly after the change. Also, I bought the car second hand so even though at 165,000 km it's most likely still the genuine coolant, I don't know for sure.

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