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Thread: TD6 Thermostat & EGR system.

  1. #1
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    TD6 Thermostat & EGR system.

    Hi guys.

    I have a (too much) cooling issue that started late last week. The car does not come up to temp in normal operation, and only makes its way to ~85 in hilly terrain or pushed hard. Bayside Brisbane isn’t exactly cold either – we are currently about as cold as it gets, it has been between 6 and 9 when I leave at dawn this past week – high teens on the way home.

    So my first thought was thermostat, however, I’ve been reading on FFRR several stories of guys replacing the main thermostat only to find it made no difference. One of the blokes then traced it to the thermo coupling in the EGR cooler which apparently has 2 thermostats in it (open at different temps). The theory is – if these are stuck open, it draws cold water from the bottom hose - away from the main thermostat which gets it opening when it shouldn’t.

    So before I replace the main stat, which is actually quite a job, I figure that the EGR removal job that’s been ignored is now at doit stage, Bypass pipe is in the mail.

    Question I have:- The guys who have done the EGR bypass fit – did you remove a cooler and disconnect some plumbing as well to get rid of the thermos? I’ve not looked under the bonnet, but in RAVE the cooler looks pretty big. If it is only a cooler for the EGR then I can't see why we would not get rid of it.

    Maybe I should do them both, remove the cooler and replace the main 'stat - give the whole system a full flush.

    Interesting to read on FFRR the guys quoting some pretty big fuel usage increase when cold….
    L322 3.6TDv8 Lux

  2. #2
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    Harlie
    I took the EGR out and just blanked of all opens easy job just make sure you get the good blank EGR stainless steel one.

  3. #3
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    I just replaced my EGR with an alloy one from Allisport . Did nothing else

  4. #4
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    Right. Looks like I need to investigate where the coolant line goes after the EGR cooler. I want the EGR cooler gone too.
    L322 3.6TDv8 Lux

  5. #5
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    Harlie
    Had a bit of a read and came up with the following !

    Faulty Temp sensor ? Check temp thru

    Range Rover Bluetooth Installation instructions


    3 thermostats in the TD6, Engine , EGR and gearbox oil cooler.

    "Speculation ? "

    Inside the gearbox oil cooler is a thermostat, if it fails it could likely let coolant circulate freely, that is bypass the main engine thermostat, therefore over cooling the engine.

    I haven't any schematics of the cooling system is this plausible ???

    Laurie

  6. #6
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    Yeah, I'm getting my temp reading from the hidden menu. However, If the temp sensor is faulty the hidden value will be out too. If the needle on the dash is lazy it will show.

    Either way, I'm sure my temp readings are correct. Hook a trailer on and it climbs to 90-91 and stays there...

    Quote Originally Posted by Laurie View Post
    ...
    Inside the gearbox oil cooler is a thermostat, if it fails it could likely let coolant circulate freely, that is bypass the main engine thermostat, therefore over cooling the engine.

    I haven't any schematics of the cooling system is this plausible ???

    Laurie
    I believe so. If the EGR thermostat is open it will also allow free circulation, which is why I'm asking about EGR system removal. If we are taking the EGR valve out, why leave the cooler there to risk it's thermo failure?

    So, I plan to remove the entire cooler unless it is feeding somthing else with coolant. Then I'm left with 2. Love to get a cooling schematic, I couldn't find one in rave.

    BTW, the trans cooler has a thermostat because it warms the trans fluid - it is not just a cooler. When I had my rebuild done, I asked about fitting another trans cooler and he said no doesn't need it - but then went on to warn - "If you really want another cooler make sure it is in line BEFORE the factory cooler, these transmissions DONOT like running cool, they need to run at 80-90"

    If it is inline before the factory cooler, it can cool the oil and the factory cooler will heat it back to 90, might help if it is really hot. Personally I won't bother, I did a heap of testing and even towing in the mountains it does not get hot.

    Anyways - back on topic. I might have to actually open the bonnet instead of reading and see what we can see.
    L322 3.6TDv8 Lux

  7. #7
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    Harlie
    Did you bleed EGR thermal valve ( by the turn screws on the valve body ), coolant rail and coolant tank when you changed the thermostat ? might have a air block ?

    Laurie

  8. #8
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    arh.... you are assuming I've actually done something Laurie. Just R&D at this stage .

    Actually waiting for the EGR bypass pipe to arrive. I was planning on removing the EGR cooler first (to get rid of 1 unneeded thermo, but since I don't know if it supplies something else that plan is still up for much debate - hence this thread.

    Now thinking of removing the cooler, replacing the main stat and doing a flush - the old girl is over due for coolant replacement. That then just leaves the Trans cooler.

    The Rangie hasn't moved for over a week now, can't rush these things.

    So what does the coolant rail feed?
    L322 3.6TDv8 Lux

  9. #9
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    Harlie
    The coolant rail feeds heater etc

    I hope the pics below might help

    Laurie
    Attached Files Attached Files

  10. #10
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    You got a few extra's there

    Laurie

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