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300td temp gauge reading hotter

Discussion in 'Defender 90 / 110 / 130' started by ONE LIFE LIVE IT. D90, Nov 9, 2014.

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  1. ONE LIFE LIVE IT. D90

    ONE LIFE LIVE IT. D90 Active Member

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    Hi there

    Did a 250 mile round trip a couple of days ago in my 300tdi 90. Doing some green lanes along with a lot of country roads.

    On the return home, i noticed the temperature gauge was reading 2/3rds or allmost 3/4 into the hot red zone. This is abnormal for the land rover, it normally sits half way. There was nothing blocking the radiator, and everything looked okay under the bonnet. This was country roads around Welshpool, about an hour from home. Im aware that the land rover gauge is very vague, however that concerned me more.

    I let the engine cool down for 20 mins, had a look under the bonnet - all was well. Compared it to another 300tdi and the hoses were pressured exactly the same, accept mine being slightly hotter. I then continued my journey home. The gauge stuck at 2/3rds all the way home with no issues at all.

    (A few months ago it had coolant, stat and rad flushed, and been fine on similar journeys....Intercooler flush, valve clearances last week, and FIP a very minor tweek)

    Can anyone help or most of all put my mind at rest. Thanks in advance
     
  2. blue beasty

    blue beasty Leaks an prone to bits dropping off Global Moderator

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    Gauge is never that accurate but you'd hope it was consistant.

    If running hotter than normal I'd check bleed valve at thermo housing to see if there's air in the system, check for cold spots on the rad, check viscous fan is working properly.

    Might be thermostat failing to open fully or pump impeller breaking up though I dont think thats often an issue with 300s.

    Was there an issue that led to flushing in the first place?
     
  3. ONE LIFE LIVE IT. D90

    ONE LIFE LIVE IT. D90 Active Member

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    Thanks for the reply. Its never had any cooling issues really, even though i was concerned some time ago. But that was my own paranoia.

    It was a new genuine land rover stat about 2 months ago but i spose that could still happen.

    How do i check the viscous fan is working properly?
     
  4. blue beasty

    blue beasty Leaks an prone to bits dropping off Global Moderator

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    With the engine cold you should be able to stop the fan with a rolled up newspaper, when it's warmed up you shouldn't
     
  5. Galvernisednuts

    Galvernisednuts Active Member

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    Fitted a genuine thermo to my 300 last year it lasted only 3 months ... Got another under warranty
    Worth a look, try a test in some boiling water
    I added a bleed to my heater pipe to aid bleeding the system after filling rad to plug opening and then thermo housing plug
    A quick blow over the filler on the expansion tank purged the air out through my new bleed point
     
  6. ONE LIFE LIVE IT. D90

    ONE LIFE LIVE IT. D90 Active Member

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    Ive just checked the viscous fan. Used a rolled up cereal cardboard packet, and it was able to stop the fan both cold and warm. It shredded the cardboard when it was warm. But it stopped.

    Is this the problem?
     
  7. jamesmartin

    jamesmartin Well-Known Member

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    check rad gets hot all over , and system is full by removing thermostat housing bung, it should over flow, fan should be solidly driven when engines hot but the fact it stiffened shows its working to some extent ,but fans not needed under normal driving as air speed is enough
     
  8. ONE LIFE LIVE IT. D90

    ONE LIFE LIVE IT. D90 Active Member

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    Thanks James, I'll check that on the text outing then.

    I wouldnt say there was a lot of difference between the fan resistance either hot or cold. Ive only just removed the viscous fan, could i have damaged it?

    Ive fitted brass plugs to the thermostat and rad. Can the O rings be swapped over from the plastic plugs? One of the o rings has ripped on the brass plugs
     
  9. blue beasty

    blue beasty Leaks an prone to bits dropping off Global Moderator

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    Don't know about damage but it does sound like fan is knackered. Shouldn't cause overheating unless worked very hard but the engine will run warmer so it could be it's the issue.

    Our rings should be the same size or pop into a plumbers merchant and pick up another for a few pence.
     
  10. Galvernisednuts

    Galvernisednuts Active Member

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    Just done a timing belt on a 200 Tdi and whilst in there noticed the viscous for the fan was poor, it was leaking too
    Checked with owner who said his temp always remained at half , he asked me to get a new one but I fitted the old one back until it arrived
    Could stop it hot or cold easily
    Reckon your prob won't just be the fan
    Defo check for air locks in system, make sure rad full to max as well, the header tank is not exactly very high on the 300 and air locks are too easy
     
    Last edited: Nov 9, 2014
  11. barmatt

    barmatt Well-Known Member LZIR Despatch Agent

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    If you were green laning at the time check your rad isn't just choked up with mud.
     
  12. Galvernisednuts

    Galvernisednuts Active Member

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    Mentioned at start.......
    There was nothing blocking the radiator, and everything looked okay under the bonnet.
     
  13. Galvernisednuts

    Galvernisednuts Active Member

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    Is this the same Landy that was down on power?
    We mentioned a compression check
    Slight overheating
    I'm wondering about the head gasket
    :-/
     
  14. barmatt

    barmatt Well-Known Member LZIR Despatch Agent

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    missed that bit, my bad.
     
  15. Galvernisednuts

    Galvernisednuts Active Member

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    Lol, that's nowt I miss plenty
     
  16. blue beasty

    blue beasty Leaks an prone to bits dropping off Global Moderator

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    Blurdy noobs :welcome::D how's tricks mate?
     
  17. barmatt

    barmatt Well-Known Member LZIR Despatch Agent

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    All good thanks mate, how's you? are the kids on here behaving at the mo?
     
  18. blue beasty

    blue beasty Leaks an prone to bits dropping off Global Moderator

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    Everyone's banned, it's just me and you left :p
     
  19. barmatt

    barmatt Well-Known Member LZIR Despatch Agent

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    Oh well so long as Mintys bar is still open we'll be ok.

    Fancy a :beer2::beer2:
     
  20. ONE LIFE LIVE IT. D90

    ONE LIFE LIVE IT. D90 Active Member

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    It is mate yes. Same vehicle!

    The coolant isnt pressurising any more that a friends 300tdi on the same journey. No mix coolant and oil.

    I find it strange it only got to 2/3rds to the hot part of the gauge, and didnt get any further.

    Did a fairly short journey today, enough to get it warm and it stuck to half way.

    Confused now
     
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