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Thread: 300Tdi Random overheat

  1. 12th February 2013, 10:19 PM #1
    TonyC
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    300Tdi Random overheat

    Hi All,

    I have a 300Tdi 130.
    The radiator has been rodded in the last 18 months, the baffle hole reduced and a VDO mechanical temp gauge and low coolant alarm fitted.

    Coming home from Wagga on Sunday, with air temp in the low to mid 30s we stopped for a few photos and left the car running with the air con on. When we got back in the temp was 115 Deg.
    Air off, heater on and gently got some road speed got the temp slowly back to 100. At the next town I stopped and pored water over the thermostat housing, this dropped the temp right back to the stop on the gauge (40) restarted the car and the temp came back up to 85 at a reasonable rate.
    Headed off, air con on, 100 km/h temp fluctuating between 88-95 like it always does under these conditions. All good for 65 km the the temp starts to rise again, stop repeat and all is good for the last 80 km home. On the second stop I cracked both the thermostat and radiator bungs and got no air just coolant.

    The trip up to Wagga on Friday was without incident and outside air temps up to 44 deg.

    I had this happen about a year ago following a thermostat change (it was sticking open) and changed the thermostat again and that seemed to fix the problem.

    So do I have
    1) A second sticking closed thermostat (both bought at the same time).
    2) A randomly failing fan clutch.
    3) Something floating around in my cooling system randomly blocking stuff.

    Thanks in advance

    Tony
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  2. 12th February 2013, 10:54 PM #2
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    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
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    sounds like the fans on the way out or its time to pulland test the themostat.
    Dave

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  3. 12th February 2013, 11:27 PM #3
    PAT303
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    Fan. Pat
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  4. 13th February 2013, 07:30 AM #4
    TonyC
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    Thanks for that,
    I think I'll order 1 of each, As much as I'd like to know which is the culprit, I want it fixed more.

    BTW
    Does a 300Tdi need a fan at hi way speeds? I had a Suzuki Sierra that I had removed the engine fan and fitted an electric and it only ever came on in hot stationary traffic or hard slow 4WDing.
    And no, I'm not thinking of removing the fan from the LR.

    Thanks again

    Tony
    Last edited by TonyC; 13th February 2013 at 07:33 AM. Reason: Grammar
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  5. 25th April 2013, 09:14 PM #5
    TonyC
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    Hi All,
    An update on this.
    I replaced the thermostat, and the temperature variations on the mechanical VDO gauge seem smother than with the old thermostat.
    I have not had another over heat.

    Tony
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  6. 26th April 2013, 01:55 PM #6
    DiscoMick Guest
    Sounds good.

    I notice on my 300Tdi the electric fans come on with the air-con and stop when its turned off. Is yours the same?

    Is anything blocking your airflow, such as driving lights?
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  7. 26th April 2013, 02:59 PM #7
    TonyC
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    Quote Originally Posted by DiscoMick View Post
    Sounds good.

    I notice on my 300Tdi the electric fans come on with the air-con and stop when its turned off. Is yours the same?

    Is anything blocking your airflow, such as driving lights?
    Hi Mick?
    Yes that is normal for the electric fan.
    I do have driving lights and a front bar, but this is more random than that. As per my original post, it was fine in the mid forties on the way up to Wagga but did the overheat trick twice in the way home in mid thirties.

    The radiator is good, water pump is near new.
    when it first did it, two thermostats ago it did it to me in mid twenties, but other days in high temps it was OK.

    I'm hopping the two thermostats I got at the same time were the same batch both with a fault, I guess time will tell.

    Tony
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  8. 26th April 2013, 07:11 PM #8
    lokka Guest
    When you first start it from cold dose the fan spin at full speed then slow down after about 30-60 secs ?

    If not i would be looking at the fan clutch as they spin at full speed until the oil in them spreads after running for a short time .

    Im not sure if they are the same as the rangie type as a ford clutch hub fits and is only about 30 bucks compaired to 100+ for the LR unit
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  9. 26th April 2013, 09:00 PM #9
    TonyC
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    Hi Lokka,

    I had not heard the locked up from the start, I'll try it.

    What Ford fan fits?

    I don't think it's the fan, as it doesn't get hot under load, over the school holidays it did a few hard low second climbs and and the temp didn't get over 92, but the weather was cool.

    It might be next summer till I know for sure.

    Tony
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  10. 27th April 2013, 01:14 AM #10
    lokka Guest
    Have a look here EA,EB by the looks will work good tec in this thread

    http://www.aulro.com/afvb/projects-t...solutions.html
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