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Thread: Overheating but why?

  1. 10th May 2025, 08:50 AM #1
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    Overheating but why?

    I'm out and about and noticed my temps on my 300tdi defender up touching the red.
    Plenty of coolant in the overflow reservoir.
    Any ideas?
    I'd go to MR Auto but they are closed on weejendw6
    It's not broken. It's "Carbon Neutral".


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  2. 10th May 2025, 08:52 AM #2
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    Oh and fluid in reservoir is hot so there's presumably circulation happening.
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  3. 10th May 2025, 09:50 AM #3
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    Dodgy radiator cap, perhaps? Try loosening it a little, when cooled.
    'sit bonum tempora volvunt'

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  4. 10th May 2025, 10:52 AM #4
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    I'd check that it is not a worn water pump or fan that's not moving water or air.
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  5. 10th May 2025, 11:09 AM #5
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    Seems to be fluctuating again. Will drove home carefully and look into it. I'm suspecting fan at the moment.
    It's not broken. It's "Carbon Neutral".


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    1993 Defender 110 ute "Doris"
    1994 Range Rover Vogue LSE "The Luxo-Barge"
    1994 Defender 130 HCPU "Rolly"
    1996 Discovery 1

    current

    1995 Defender 130 HCPU and Suzuki GSX1400

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  6. 10th May 2025, 12:13 PM #6
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    Quote Originally Posted by VladTepes View Post
    Oh and fluid in reservoir is hot so there's presumably circulation happening.
    Oh. I was going to suggest thermostat.
    So, along with the other suggestions, partially blocked radiator, collapsed hose(s), or of course the dreaded head gasket.
    Also, is it actually hot? I mean are there overheating symptoms other than the gauge? iOS, could it be electrical?
    ​JayTee

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  7. 10th May 2025, 02:15 PM #7
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    300tdi defender up touching the red.

    Hate to say it
    But from above info it’s head gasket till proven otherwise
    The normalised gauge doesn’t move till your up over 100
    The red is pretty much 125 from memory

    Of course feel free to change all the other bits

    Or just muck in a knock the head off doesn’t take long
    '95 130 dual cab fender (gone to a better universe)
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