Colt 2.8 TDi overheating problems





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  1. #1
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    Default Colt 2.8 TDi overheating problems

    Hopefully some of you clever okes can help me here.....my 2006 Colt 2.8TDi with under 100 000k's on the clock runs way too hot for my liking. Just prior to a Moremi/Chobe trip last June I took it in to have this checked out by some diesel specialists. They suspected the head and with my permission took it off. The pressure test revealed that the head was not cracked, but I told them to replace it with a new AMC head anyway to be sure. I also got them to replace the water pump, the thermostat, the sender, the radiator cap, remove and flush the radiator numerous times and check/test the viscous fan.
    All seemed fine for a couple of days until on a longish trip it started to get too warm on uphill sections, unloaded. It must be noted that I'm not an 18 yr old idjit anymore and therefore drive very conservatively, never exceeding 3000rpm and I usually cruise at 110km/h on highways.
    The temp gauge never reached the red, but would climb to 2/3, or nearer 3/4 I suppose, indicating something obviously amiss. I have taken it back now on numerous occasions and everyone is left scratching their heads in puzzlement. We have taken off the bash-plate which stretches from the ARB bumper downwards, in an effort to increase airflow, but this has made no difference.
    I replaced the thermostat yet again to no avail. In fact I then drove in to Silverton Radiators to test the head/cap and thermostsat once again - they told me the thermostat was opening late causing the issues - but it's brand new from Mitsubishi and the 3rd one I've put in!!
    What on Earth would cause numerous thermostats to either open late or not at all? I have removed the thermostat and it runs beautifully - gauge sits just below 1/2 where it should be - but this is not a long-term solution.
    Any ideas??
    "a soutie who has miraculously survived the pist 'n broke years..... "

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    Are you sure the thermostat is not installed upside down, causing a flow restriction?

    You could also test the thermostat in a pot of water on the stove to physically measure the temperature where it starts opening, and to ensure that it opens fully. I suppose even brand-new thermostats can be faulty, maybe MrBishsi has a bad batch in stock? Try one from a different dealership or another parts supplier like Midas?
    - Nothing comes at a higher price than that which is free.

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    ? Just like how the fridge has a digital thermortat can we not get a digita thermortat for the cooling system Im sure it will be more accurate

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    Quote Originally Posted by Blue Shirt View Post
    Are you sure the thermostat is not installed upside down, causing a flow restriction?
    Nope, but I'll check.....didn't know you COULD install it upside down

    You could also test the thermostat in a pot of water on the stove to physically measure the temperature where it starts opening, and to ensure that it opens fully. I suppose even brand-new thermostats can be faulty, maybe MrBishsi has a bad batch in stock? Try one from a different dealership or another parts supplier like Midas?
    Will do...thanks Blue Shirt (go Stormers!)
    "a soutie who has miraculously survived the pist 'n broke years..... "

  5. #5
    LewiesF Guest

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    Quote Originally Posted by Noordhoeknic View Post
    Nope, but I'll check.....didn't know you COULD install it upside down



    Will do...thanks Blue Shirt (go Stormers!)
    In my experience of replacing thermostats in numerous vehicles from different manufacturers, ranging from a FIAT 850 Special of 1971 up to a Mazda Etude of 2003, and it's so easy to install the thermostat right side up that I doubt even an honest to goodness mechanic will get it wrong.
    And I doubt if it will open at all if it is upside down. Is the reading - if one should call it that - on the heat gauge the same as it was before you replaced the sender? I replaced one of those on my Isuzu some time ago - more than a year - (pirate from Midas) and after that the reading for normal temperature was higher than before. It now shows about 2/3 of max at normal temp, where it previously showed about 1/3, and it's not overheating.

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    Default colt 2.8 tdi overheating problems

    Quote Originally Posted by Noordhoeknic View Post
    Nope, but I'll check.....didn't know you COULD install it upside down



    Will do...thanks Blue Shirt (go Stormers!)
    Well you have changed everything else and you still have the same problem, the only other thing it could be thats giving you these temp readings, is the temp sender unit or the gauge inside the car, could be faulty and indecateing that its hotter than it really is, on the needle reading, mitsu gauges are not always showing you the right temp readings at the best of times.
    Now the only other thing it could be is an AIR blockage in the system, try bleeding it if the temp sender guage after you have changed it, doesn't read any lower, otherwise its a mystery.

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    Quote Originally Posted by LewiesF View Post
    . Is the reading - if one should call it that - on the heat gauge the same as it was before you replaced the sender?
    Yep - exactly the same......
    "a soutie who has miraculously survived the pist 'n broke years..... "

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    Quote Originally Posted by scorpion 42 View Post
    Well you have changed everything else and you still have the same problem, the only other thing it could be thats giving you these temp readings, is the temp sender unit or the gauge inside the car, could be faulty and indecateing that its hotter than it really is, on the needle reading, mitsu gauges are not always showing you the right temp readings at the best of times.
    Checked gauge and replaced sender...the vehicle IS getting hot...

    Now the only other thing it could be is an AIR blockage in the system, try bleeding it if the temp sender guage after you have changed it, doesn't read any lower, otherwise its a mystery.
    Done that a couple of times too....still a mystery.
    "a soutie who has miraculously survived the pist 'n broke years..... "

  9. #9
    LewiesF Guest

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    OK, so we can rule out the sender and everything else you've replaced. A lot of time passed between me starting my reply and posting it and the I saw you've bled it. Thermostats have their opening temp. stamped on the somewhere, you could check that out and see if you could get the correct, design opening temp somewhere -like in a shop manual, dealer's workshop, etc.
    Last edited by LewiesF; 2011/04/28 at 05:31 PM.

  10. #10
    LewiesF Guest

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    You make no metion of the engine smoking, so I assume tha's not the case? Black smoke when acellerating hard or when going up a steepish hill in top gear while you put foot?

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    Quote Originally Posted by LewiesF View Post
    You make no metion of the engine smoking, so I assume tha's not the case? Black smoke when acellerating hard or when going up a steepish hill in top gear while you put foot?
    Nope - no smoke whatsoever
    "a soutie who has miraculously survived the pist 'n broke years..... "

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    Default colt 2.8 tdi overheating problems

    since this has been happening, how often do you have to replentish the coolent and by how much each time? The reason I am asking you this, is because it maybe suffering from a minute leak, that only comes on, when it starts to get hot and then pressurising the hoses and you only have to have a pin hole in this situation for it to do this, over heating procces, have you or your garage done a pressure test on the system, to see if they or you can spot this leak, if not, then I think thats your next try, dont you and what have you got to loose, it seems to be a puzzle.

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    Quote Originally Posted by scorpion 42 View Post
    since this has been happening, how often do you have to replentish the coolent and by how much each time? The reason I am asking you this, is because it maybe suffering from a minute leak, that only comes on, when it starts to get hot and then pressurising the hoses and you only have to have a pin hole in this situation for it to do this, over heating procces, have you or your garage done a pressure test on the system, to see if they or you can spot this leak, if not, then I think thats your next try, dont you and what have you got to loose, it seems to be a puzzle.
    The whole system has been pressure tested again and again....it also doesn't use/lose any water!!! Weird
    "a soutie who has miraculously survived the pist 'n broke years..... "

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    Default colt 2.8 TDi overheating problems

    Noordhoeknic, have you tried an after market thermostat, just to rule out the Mitsi ones, seeing you have had three from them and did you get them from the same mitsi place has they COULD be carring a bad batch of them.
    Failing this and an after market one doesn't do the trick, then I would be wondering if this AMC head could be your trouble as I cant for the life of me, see what else it could possible be. As it seems a real mystery.

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    I would aslo check the pipe that goes to the overflow bottle to see if it is not blocked...
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    Quote Originally Posted by scorpion 42 View Post
    Noordhoeknic, have you tried an after market thermostat, just to rule out the Mitsi ones, seeing you have had three from them and did you get them from the same mitsi place has they COULD be carring a bad batch of them.
    No I haven't - maybe I'll give one a try....
    "a soutie who has miraculously survived the pist 'n broke years..... "

  17. #17
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    Quote Originally Posted by Kallie View Post
    I would aslo check the pipe that goes to the overflow bottle to see if it is not blocked...
    Checked....all clear
    "a soutie who has miraculously survived the pist 'n broke years..... "

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    Had the same with mine. Did the pump and injectors, sorted out the issue, BUT I have found that the guage would go up without the engine been hot, this happen in rain and dense fog. Think when the sensor gets wet, it creates a short, had temp seems to go up. I stoppen felt the water pypes, not hot at all.

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    You could check your air intakes to the motor.

    If the intake is clogged and the filter is blocked it causes the ejectors to overheat pushing the temp of the motor up.

    I have seen this happen before.
    This goes for the intercooler as well.
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  20. #20
    LewiesF Guest

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    Quote Originally Posted by Scraps View Post
    You could check your air intakes to the motor.

    If the intake is clogged and the filter is blocked it causes the ejectors to overheat pushing the temp of the motor up.

    I have seen this happen before.
    This goes for the intercooler as well.
    Wouldn't blockages you describe cause a reduction in power as well, Scraps? How about that Nic, noticed anything of the kind?

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