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Thread: Thermostat?

  1. 29th July 2019, 05:05 PM #1
    acgmarketing
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    Thermostat?

    Engine was very hot to the touch this afternoon on the exposed rockercover. Water pipe from engine to radiator (with bleed screw) also hot to touch and radiator top similar but not as hot. Pipe from radiator to thermostat assembly on driverside of engine bay cold to touch. Also water overflow reservoir was empty. Started engine and filled reservoir with water, jet of warm water was immediately flowing into reservoir (prior to adding water).

    Does this sound like a mis functioning thermostat?
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  2. 29th July 2019, 09:36 PM #2
    biggin
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    The empty reservoir is a worry. Where did the missing coolant go?
    I just recently replaced a thermostat for a lower temperature one and found the temperature was all over the place. I’ll now replace the viscous coupling and then reassess.
    2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Nanocom(V8 only)
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  3. 10th August 2019, 12:04 PM #3
    acgmarketing
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    Well old one out today and happily opened in pot on stove at about 89-90. So ... now what I wonder ...
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  4. 11th August 2019, 06:12 AM #4
    Pedro_The_Swift's Avatar
    Pedro_The_Swift
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    any pipes disconnected recently?
    some recent posts about wrong connections with Td5's
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
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    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  5. 11th August 2019, 09:40 PM #5
    acgmarketing
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    Quote Originally Posted by Pedro_The_Swift View Post
    any pipes disconnected recently?
    some recent posts about wrong connections with Td5's
    Replace thermostat yesterday and found fuel cooler pipe connected to dead end spigot where line to oil cooler ought to be connected. Rest all in correct spots and the old thermostat show working ok in water pot on stove. New thermo is 78 degree model. All seemed ok today on longer run although noticed water down in overflow (was about 1 lt down) so refilled (might just be air bleeding through despite me following usual coolant filing method).
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  6. 26th August 2019, 02:47 PM #6
    biggin
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    I have recently installed a new 78 deg Thermostat and found that the motor temp constantly cycles between about 85 to 95 degrees (Nanocom) in about a five minute period. Surely this is too high for cold weather driving with the AC off. My old thermostat used to sit on 92 degrees in cold or hot weather. Is this a bad thermostat or something else? I suspect the thermostat is sticking and not opening properly. Does this sound likely.
    2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Nanocom(V8 only)
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  7. 27th August 2019, 05:50 AM #7
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    Pedro_The_Swift
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    The whole idea behind LR's cooling/heating is "blend".... so NO temp spikes or sudden changes, even under hard use the rise should be gradual...
    so if the temps are actually cycling up and down,, something is amiss...
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  8. 27th August 2019, 09:34 AM #8
    biggin
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    Yes, this is my understanding also. I can only think of the new thermostat causing this.
    2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Nanocom(V8 only)
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  9. 27th August 2019, 11:16 AM #9
    PhilipA
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    Are you sure that you have the hoses around the correct way?

    My 2002 EU3 rests around 82-85C nearly all the time, with a sojourn up to 88-90C up a big hill while towing.

    This is on a digital gauge which I have checked correlates to Nanocom within 0.5C.

    Only ever been to 100C once with my old radiator, a faulty VC bearing pulling up The 21KM Alpine Way towing 1000Kg.
    Regards Philip A
    Whoops looked back and V8. Mine is TD5. Even so cycling is a worry.
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  10. 27th August 2019, 11:53 AM #10
    Kaaaiju
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    What temp themo state you got Philip?
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