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Thread: Radiator Reflush in a KV6, FL1

  1. #1
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    Radiator Reflush in a KV6, FL1

    About to do a service on my 2001 FL1, KV6 and as part of the service I will be flushing out the radiator. I have a question?????
    I have purchased a 2.5litre pack of Nulon Red Long Life 100% Concentrated Coolant of which the instructions say, mix 50/50 with water. However, a friend of mine who is a mechanic says, "don't use water use the coolant straight, don't dilute"
    The coolant system takes 7.8litres and the 2.5litre pack cost nearly $28 so it is an expensive exercise, BUT the cost is not a factor if gains are made by not using water!!
    Any opinions???

  2. #2
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    You must dilute with water and I would use distilled water. I am not sure what the different concentrations are (it is on the bottle) - normally 1 unit of coolant to two units of water is for temperate use, I unit of coolant to 1 unit of water is for extreme use - again details on the bottle.

    Full functionality is not achieved if 100% solution is used and may damage your engine.

    If it is safe to use at 100% I am sure the maker would give you the option after all it would make them more money.

    Are you sure you mate is not talking about pre mixed coolant.

    Garry
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  3. #3
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    The technical answer is heat transfer efficiency. I was looking thru the Wikipedia article on the either the Merlin engine or Spitfire/Mustang aircraft. (Can't remember which). Early on they were using straight ethylene glycol, and it was running OK, but then went to a mix of water and EG, and got a big temp drop, so they could use more boost.

    So the magic number is somewhere between 33%- 50% of water, depending on local temperatures and use. Google anti freeze and follow links to ethylene glycol etc for more info.

    Note - buy your DE-Mineralised water from a supermarket ( 5L = $3).

  4. #4
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    use it as per the instructions. The genuine Land Rover coolant was straight when it was 1st used and then there was a recall to replace all the coolant hoses and dilute to 50%. If it has green coolant in it replace it with green coolant, Do not mix them.

  5. #5
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    Quote Originally Posted by Ausfree View Post
    About to do a service on my 2001 FL1, KV6 and as part of the service I will be flushing out the radiator. I have a question?????
    I have purchased a 2.5litre pack of Nulon Red Long Life 100% Concentrated Coolant of which the instructions say, mix 50/50 with water. However, a friend of mine who is a mechanic says, "don't use water use the coolant straight, don't dilute"
    The coolant system takes 7.8litres and the 2.5litre pack cost nearly $28 so it is an expensive exercise, BUT the cost is not a factor if gains are made by not using water!!
    Any opinions???

    Hi Jim.

    This is the same stuff I run in the Td5 at 50/50. See above where I've highlighted in red ? The product comes Concentrated or Diluted (diluted is already mixed with water at 50/50). Your 2.5L of Concentrated needs to be mixed with an equal volume of water ... meaning you'll only mix up 5L ... not enough ... take it back and get a 5L of Concentrated. My last 5L cost around $40 give or take a few $$ ... when you're done you'll have enough over for top-ups ... and buy 2 x 5L distilled water as well.

    Don't run Concentrated undiluted as it looses it ability to do its job and becomes increasingly less effective as the mix rises above 50/50.
    Kev..

    2004 D2a Td5 Auto "Classic Country" Vienna Green
    2015 Kimberley Kamper "Classic"

  6. #6
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    Nulon at 50/50 will eat gaskets I always ran it at 50/50 but recently a wise man who did my cylinder head that my coolant was too strong.
    He was adamant that I should run it in the high 30s.
    A V6 Freelander should be vacuum filled as you will have issues with air blocks if you don't.
    I know of one case where the heads were removed to overcome an overheating problem at a crash repairer the reality was that they pulled the radiator didn't fill it properly and had continual issues.
    The above mentioned wise man visited and vacuum filled it and it was OK after that.
    Even though they pulled the heads thinking that there was another issue.
    Oh the premix that you buy is a bit over 30% if you test it

  7. #7
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    Hi Jim.

    Here's the info from Nulon for the concentrate
    Red Long Life Concentrated Coolant- Nulon Australia

    and the pre-mixed (note it says pre-mixed is 50/50 ready to use).
    Red Long Life Top-Up Coolant- Nulon Australia

    Note also they reccomend a total cooling system flush using R40 before changing brands of coolant ...
    Radiator Flush and Clean- Nulon Australia

    Your challenge will be getting a complete draining of the coolant ... it won't drop 7.8L when you drain it, so 2,3,4 or more drain and refill & drive with water only will be required (after flushing) to ensure ALL the old coolant is removed. Measure how much you drain so you know how much is left in the cooling system so you can can work out your mix rate .... should be 4L (3.9L) of Nulon RLL added to whatever's left over in the cooling system, then top off with water.

    I don't know if you have a copy of Rave for the FL, so I've attached the drain & refill pages fyi.

    Cheers
    Attached Files Attached Files
    Kev..

    2004 D2a Td5 Auto "Classic Country" Vienna Green
    2015 Kimberley Kamper "Classic"

  8. #8
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    Quote Originally Posted by Fluids View Post
    Hi Jim.

    Here's the info from Nulon for the concentrate
    Red Long Life Concentrated Coolant- Nulon Australia

    and the pre-mixed (note it says pre-mixed is 50/50 ready to use).
    Red Long Life Top-Up Coolant- Nulon Australia

    Note also they reccomend a total cooling system flush using R40 before changing brands of coolant ...
    Radiator Flush and Clean- Nulon Australia

    Your challenge will be getting a complete draining of the coolant ... it won't drop 7.8L when you drain it, so 2,3,4 or more drain and refill & drive with water only will be required (after flushing) to ensure ALL the old coolant is removed. Measure how much you drain so you know how much is left in the cooling system so you can can work out your mix rate .... should be 4L (3.9L) of Nulon RLL added to whatever's left over in the cooling system, then top off with water.

    I don't know if you have a copy of Rave for the FL, so I've attached the drain & refill pages fyi.

    Cheers
    Thanks for that Kev, I do have a copy of Rave and I have drained and flushed the system before and you can't do it in one go as it is a tricky operation, so I intended to drain and refill several times with ordinary water before adding the coolant. There is a small bleeder valve on one of the heater hoses near the firewall and you have to be VERY careful about air pockets in the system!!!! I will also take advice and use distilled water with the coolant, which I haven't done before!!!

  9. #9
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    Gotta love LR.

    We can keep AIR in ... but the OIL ....

    Kev..

    2004 D2a Td5 Auto "Classic Country" Vienna Green
    2015 Kimberley Kamper "Classic"

  10. #10
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    ......... while you're at it check the coolant hoses for perishing etc, (especially the plastic 'T' fittment connected to the top radiator hose, this tends to crack/split/break over time) and look for any hoses that are close to the chassis or engine block that may rub and eventually leak.

    Also be very careful not to loose the lil plastic 'air bleed' bolt down the back of the abyss of your engine bay, otherwise you'll have the unenviable pleasure of trying to retrieve it with a long bit of stick or taking the skid plate off (not fun believe me)

    As for the coolant I bought the 5litre pack of Nulon concentrate and used that for the mix, diluted it 50/50 (about 3.5 litres of it [3.5 litres Nulon to 3.5 litres water]) I used normal tap water, dont see any reason why it will harm the coolant system.

    Have fun!

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