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Thread: Radiator Flush Technique Question

  1. #71
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    Tanks and Caps = Always Genuine Radiator Flush Technique Question
    Same for hoses (excluding Turbo hoses)

  2. #72
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    Small pipe to hard pipe circled in yellow you drained from, what sort of connection is that? Can’t quite tell in photo?

    Scott
    D4 TDV6 MY14 with Llams, Tuffant Wheels, Traxide DBS, APT sliders & protection plates, Prospeed Winch Mount w/ Carbon 12K, Mitch Hitch & Drifta Drawers
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    Ex '77 RRC 2 door. Long gone but not forgotten.

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    Radiator Flush Technique Question

    Quote Originally Posted by LRD414 View Post
    Small pipe to hard pipe circled in yellow you drained from, what sort of connection is that? Can’t quite tell in photo?

    Scott
    Firstly, good news is my float switch is back from the dead and no low coolant dash warning.

    I had the problem during the demin water rinse stage. Now it has the new coolant it’s back to normal. It’s like the SG of the water was not enough but it’s happy to float in the new coolant. I also gave the tank a few sharp taps as I filled it.

    LRD414 it is the simplest connection you will ever find. The smaller pipe is a plastic pipe that runs around to the fuel cooler. It has a barbed end that goes into the rubber hose with a very easy small spring clamp on it. 5 seconds to pull apart vs those nasty white plastic barbs and don’t forget it’s all warm and soft when you pull it apart.

    The plastic pipe clips into a few retainers so you can release it and get great access.

    The benefit of this pipe is that it comes from the same side of the thermostat that the lower large radiator hose feeds into so in effect you are draining from the lowest possible point.

    When draining the coolant you can blow in the the bottle or use a bit of compressed air between your fingers over the opening. Both work well in getting more to come out.

    I reckon I’ve got 9 litres into it now with a few top ups today.

  4. #74
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    Final update - still adding a little bit 4 days later to bring coolant to top cold fill line. Definitely more than 9 litres of fresh coolant so satisfied very little old stuff remains in the system. Filling needs patience.

    I don’t have rear air cond.

    Float switch still floating also.

  5. #75
    BradC is online now Super Moderator
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    Quote Originally Posted by PerthDisco View Post
    It’s like the SG of the water was not enough but it’s happy to float in the new coolant.
    This isn't unusual for a float that is slowly losing its "float". I'd put a new bottle on the list for your next proactive parts order.

    I reckon I got > 9L out of mine draining by the fuel cooler connection, but it was _sloooow_ and my system holds a little bit more with the FBH. Next service it's due for a flush and I'll be using the line you did. Thanks for the pics and follow up.

  6. #76
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    Did you have the cap off the bottle as well?

    Mine came out pretty good!

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    Radiator Flush Technique Question

    Quote Originally Posted by Tombie View Post
    Did you have the cap off the bottle as well?

    Mine came out pretty good!
    In my case yes and also the bleed screws open.

    I split both sides of the fuel cooler lines. The supply from the thermostat gushes out fast as the pipe will flow. It’s coming directly from the big bottom radiator 1.5” hose.

    The other side I assume is the return that connects back up into the lower radiator on the opposite side tank to the main return line. It’s only a half” or less pipe.



    It’s the items in the box marked PIH500101

  8. #78
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    Radiator Flush Technique Question

    Mine was deliberately parked downhill when changing and uphill when finalising the refilling.

    Makes life easy Radiator Flush Technique Question

    After topping and bleeding went to a nearby offroad area and put the nose up about 30 degrees and bled it again and topped up.

  9. #79
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    Radiator Flush Technique Question

    Quote Originally Posted by Eric SDV6SE View Post
    Super cheap auto. Brand is champion. Fitting costs 10 bucks, but better than losing all your coolant and overheating engine. Thanks again to Dazza for the tip.
    Brief update
    Have tightened this plug a few times but a small drop of coolant is still getting past the thread. Will refit with thread tape.

    On the weekend I gave it it a very hard run in soft beach sand with too hard tyres. For first time ever the coolant temp gauge lifted above horizontal.

    I stopped immediately and pooped myself thinking something had blown off but nothing was wrong and coolant was all there. I used the heat pressure to give the top hose another bleed which did release air. Tyres let down and all back to normal but bleeding this thing may be an art form as Tombie suggests.

  10. #80
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    Mine definitely “burped” once it got really hot when I was offroading as when I next looked at the overflow bottle it was half an inch lower once cooled down. I didn’t get a temp issue though. The level has not budged since.

    I ended up getting a new top crossover pipe and plastic plug instead of a replacement plug (couldn’t find something that fit at the time). I was pretty sure it was 10mm x 1mm thread or something.

    Anyhow the pipe with new screw was $30 from the stealer so at that price, it wasn’t worth trying to find an alternative. I’ll replace it again in another ten years, lol.
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

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