Pajero sport coolant loss through radiator cap





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  1. #1
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    Default Pajero sport coolant loss through radiator cap

    At a bit of a loss here. My 2015 2.5 PS boiled (?) out of the radiator cap twice this weekend. Once after my drive back home (around 350km), after standing for about half an hour I noticed a small green puddle, and then again on Saturday morning after a quick trip to town.

    Coolant level has not changed, not oil in the radiator or overflow, and no water in on the dipstick or oil filler cap.

    Everything I read online says failed radiator cap, but I've never heard of them failing before?
    Office Johnny

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    Default Re: Pajero sport coolant loss through radiator cap

    There was a updated radiator cap with higher pressure rating, if I can recall correctly

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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by Greenhorn View Post
    There was a updated radiator cap with higher pressure rating, if I can recall correctly
    For the 2.5 HO? Mine is 1.1bar, any info on the updated rating?
    Office Johnny

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    Default Re: Pajero sport coolant loss through radiator cap


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    Default Re: Pajero sport coolant loss through radiator cap

    Itís a formal recall - dealer needs to test and replace cap and coolant

  6. #6
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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by petermoffat View Post
    At a bit of a loss here. My 2015 2.5 PS boiled (?) out of the radiator cap twice this weekend. Once after my drive back home (around 350km), after standing for about half an hour I noticed a small green puddle, and then again on Saturday morning after a quick trip to town.

    Coolant level has not changed, not oil in the radiator or overflow, and no water in on the dipstick or oil filler cap.

    Everything I read online says failed radiator cap, but I've never heard of them failing before?
    Did you get a new engine?

  7. #7
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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by Greenhorn View Post
    Thanks, I have the old radiator cap, will take a drive to the dealership now.
    Office Johnny

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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by Teryos View Post
    Did you get a new engine?

    AFAIK it is the original motor, 2.5 High Output
    Office Johnny

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  9. #9
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    Default Re: Pajero sport coolant loss through radiator cap

    Only 4 reasons for this symptom:

    - head gasket
    - radiator cap
    - blocked radiator
    - worn water pump
    2012 Jeep Sahara Unlimited 3.6 V6
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  10. #10
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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by petermoffat View Post
    AFAIK it is the original motor, 2.5 High Output
    Please contact Mitsubishi. Your car seems in need of a new engine altogether due to coolant (hence overheating) issue. All expenses are on Mitsubishi.
    Last edited by Teryos; 2019/07/08 at 09:46 AM.

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    Default Re: Pajero sport coolant loss through radiator cap

    Campaign has not been done, vehicle booked in for Thursday.
    Office Johnny

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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by Teryos View Post
    Please contact Mitsubishi. Your car seems in need of a new engine altogether due to coolant (hence overheating) issue. All expenses are on Mitsubishi.
    That seems a bit extreme for a few millimetres of coolant loss?
    Office Johnny

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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by petermoffat View Post
    That seems a bit extreme for a few millimetres of coolant loss?
    Perhaps that's tip of the iceberg. You never know...

  14. #14
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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by jelo View Post
    Only 4 reasons for this symptom:

    - head gasket
    - radiator cap
    - blocked radiator
    - worn water pump
    1. No oil on radiator cap or in the reservoir, and no water on the oil filler cap or dipstick, so, I don't suspect that. The vehicle has not 'overheated'. Though I don't know if boiling out of the cap counts? I turned it on the last time it did this, and the temp was where it normally is.

    2. This seems to be the issue under campaign, booked and will get tested later this week

    3. I don't know how to test for this, top hose is not rock hard, nor completely pap when running at normal temp?

    4. I've had as good a look as I can, but I don't see it leaking from anywhere other than the few drops at the radiator cap.
    Office Johnny

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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by petermoffat View Post
    1. No oil on radiator cap or in the reservoir, and no water on the oil filler cap or dipstick, so, I don't suspect that. The vehicle has not 'overheated'. Though I don't know if boiling out of the cap counts? I turned it on the last time it did this, and the temp was where it normally is.

    2. This seems to be the issue under campaign, booked and will get tested later this week

    3. I don't know how to test for this, top hose is not rock hard, nor completely pap when running at normal temp?

    4. I've had as good a look as I can, but I don't see it leaking from anywhere other than the few drops at the radiator cap.
    to break it down, those are the only reasons for excess pressure : excessive heat and excessive gas

    The temp gauge is useless on its own. Any owner of any turbo diesel with some age on it should fit an aftermarket engine monitoring system with an alarm.
    By the time the temp gauge shows an overheat condition, the damage is usually already done.

    Replace the cap with a ORIGINAL CAP with the correct pressure rating, then monitor.
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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by jelo View Post
    to break it down, those are the only reasons for excess pressure : excessive heat and excessive gas

    The temp gauge is useless on its own. Any owner of any turbo diesel with some age on it should fit an aftermarket engine monitoring system with an alarm.
    By the time the temp gauge shows an overheat condition, the damage is usually already done.

    Replace the cap with a ORIGINAL CAP with the correct pressure rating, then monitor.
    Please shed some more light. Where? What? How much?

  17. #17
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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by jelo View Post
    to break it down, those are the only reasons for excess pressure : excessive heat and excessive gas

    The temp gauge is useless on its own. Any owner of any turbo diesel with some age on it should fit an aftermarket engine monitoring system with an alarm.
    By the time the temp gauge shows an overheat condition, the damage is usually already done.

    Replace the cap with a ORIGINAL CAP with the correct pressure rating, then monitor.
    Thanks Jelo, yes, I've been through those items, and the only one I can't test is the cap itself, which it turns out is under a recall, to be replaced with a higher rated one by Mitsubishi. Coolant level is still where it was on Saturday, with 400km of driving since then, so I don't think it's getting hot.
    Office Johnny

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  18. #18
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    Default Re: Pajero sport coolant loss through radiator cap

    Quote Originally Posted by Teryos View Post
    Please shed some more light. Where? What? How much?
    google "madman ems" or "little black box" as a start
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  19. #19
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    Default Re: Pajero sport coolant loss through radiator cap

    Car went in for this today. The test procedure is pretty robust, lots of pressure testing, fluid level testing, stressing the motor, etc., to ensure there is no damage to head gasket or other leaks.

    All tests passed, radiator flushed and filled with new coolant mixture 50/50, old 108kpa cap replaced with 127kpa, software update was apparently done previously, so not done today.

    Total cost around R2500, of which I had to pay R0.
    Office Johnny

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  20. #20
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    Default Re: Pajero sport coolant loss through radiator cap

    Glad to see Mitsu still willing to solve the issue.Great

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