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Thread: p38 over heating!!!!!!!

  1. #1
    **Discovery300Tdi** Guest

    p38 over heating!!!!!!!

    g'day guys,


    just was wondering if anyone could help???? my rangie has been heating up lately. just flushed out the radiator a few days ago and topped her up. mind you i've had this heating up problem even before that. now i'll be driving for about 30mins when the temp goes up slowly till it hits the red. get out open bonnet and see alot of preasure coming from the coolant res. go and squeeze the top rad hose and it is hard as a rock, open the coolant res and the preasure is crazy, then the top hose is soft agqain. there is no thermotat, well i think there isn't??? were can i find it????? had a look when i took the top rad hose off and theres no thermostat there?????

    please help!!!!
    cheers simon

  2. #2
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    Quote Originally Posted by rangiep38 View Post
    g'day guys,


    just was wondering if anyone could help???? my rangie has been heating up lately. just flushed out the radiator a few days ago and topped her up. mind you i've had this heating up problem even before that. now i'll be driving for about 30mins when the temp goes up slowly till it hits the red. get out open bonnet and see alot of preasure coming from the coolant res. go and squeeze the top rad hose and it is hard as a rock, open the coolant res and the preasure is crazy, then the top hose is soft agqain. there is no thermotat, well i think there isn't??? were can i find it????? had a look when i took the top rad hose off and theres no thermostat there?????

    please help!!!!
    cheers simon
    Sorry Simon, but it sounds awfully like a blown head gasket to me. They were the symptoms I have had with 3 RRCs so far, and in each case that was the problem. The way to check is to take it to a radiator place and they will test for hydrocarbons in the coolant.

    Willem

  3. #3
    **Discovery300Tdi** Guest
    Quote Originally Posted by willem View Post
    Sorry Simon, but it sounds awfully like a blown head gasket to me. They were the symptoms I have had with 3 RRCs so far, and in each case that was the problem. The way to check is to take it to a radiator place and they will test for hydrocarbons in the coolant.

    Willem

    g'day matey

    well thats great news lol!!! had a feelin it was something like that. are they fun to change???? how much are the gaskets??? cheers mate

  4. #4
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    The thermostat is in a plastic housing attached to the lower radiator hose and can be accessed from underneath the front of the vehicle.

    Your symptoms would tend to indicate slipped cylinder liners(although there can be other causes )....and if it has been hot (in the red ) you can nearly guarantee the liners will be the problem. Is it using water ?

  5. #5
    **Discovery300Tdi** Guest
    Quote Originally Posted by ivery819 View Post
    The thermostat is in a plastic housing attached to the lower radiator hose and can be accessed from underneath the front of the vehicle.

    Your symptoms would tend to indicate slipped cylinder liners(although there can be other causes )....and if it has been hot (in the red ) you can nearly guarantee the liners will be the problem. Is it using water ?

    no im not loosing any water at all, no leaks. just alot of preasure when i open the coolant resi. thinking it might be themostat sticking. i hope!!!!! lol

  6. #6
    mike 90 RR Guest
    Quote Originally Posted by rangiep38 View Post
    g'day guys,


    just was wondering if anyone could help???? my rangie has been heating up lately. just flushed out the radiator a few days ago and topped her up. mind you i've had this heating up problem even before that. now i'll be driving for about 30mins when the temp goes up slowly till it hits the red. get out open bonnet and see alot of preasure coming from the coolant res. go and squeeze the top rad hose and it is hard as a rock, open the coolant res and the preasure is crazy, then the top hose is soft agqain. there is no thermotat, well i think there isn't??? were can i find it????? had a look when i took the top rad hose off and theres no thermostat there?????

    please help!!!!
    cheers simon
    Flushing don't help much .... You have to rod it clean
    I think your thermostat is located "at / along" the "Bottom" radiator hose location

    When it heats up .... are we talking Hwy speeds ...

    Mike


  7. #7
    **Discovery300Tdi** Guest
    Quote Originally Posted by mike 90 RR View Post
    Flushing don't help much .... You have to rod it clean
    I think your thermostat is located "at / along" the "Bottom" radiator hose location

    When it heats up .... are we talking Hwy speeds ...

    Mike

    it heats up very slowly on the freeway but is stable ,but mainly start/stop driving. this heat dont help either.

  8. #8
    mike 90 RR Guest
    Quote Originally Posted by rangiep38 View Post
    it heats up very slowly on the freeway but is stable ,but mainly start/stop driving. this heat dont help either. Yep ... Rod it
    We could go the Expensive way and recon your motor .... or you could rip out the radiator and spent less than $150 and install a new thermostat & ROD the radiator ...... Many have had the same complaint ... and this has solved the problem

    It's Hot weather and your A/C that ain't helping .... If that don't cure it ... then you have to put a "gas test kit" into the coolant to find out if you indeed have a head problem

    I would stop driving it now and do it (Rod the radiator) pronto .... as constant overheating of the motor will lead to head problems VERY fast



    A trick to help "keep the edge of cool" of the motor is to wind down the windows and turn the heater onto "flat out hot" ... you'l cook but it helps the radiator



    Mike


  9. #9
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    Have seen same symptoms from failing viscous fan clutch...cheaper fix too.

  10. #10
    **Discovery300Tdi** Guest
    how do you open the housing with the thermostat????

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