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Thread: Help overheating problem

  1. #1
    SkippyGU JackCollo's Avatar
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    Help overheating problem

    Hey guys I urgently need to find the source of the problem my patrol has developed. So basically since MELBOURNE has been quite hot over the last few days I’ve been careful on coolant temperatures but everyday it has been hot it has had problems.
    So what happens is that normal driving around is fine and traffic is fine but as soon as I power the car off the water spews out all over the place and I have repeatedly bled the system and topped the water up. This only happens after the car has been switched off not while operating. Can you guys help me please
    Regards jack


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    Currently own a ZD30 2000 GU patrol with a dead injector pump about to start a build on a TD42 motor to go in the car and basically rebuild the whole car into a machine of a rig

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  3. #2
    I am he, fear me the evil twin's Avatar
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    Could be one or more of quite a few things...
    First thing I would do is get a pressure test done and also replace the Rad Cap
    Did you try burping the system?
    Slight nose up, cap off, run the engine for a couple of minutes

    When you switch off you get a very significant heat spike so it can be low pressure in the coolant system or air pockets

    Do the easy/cheap things first and work from there
    Last edited by the evil twin; 21st November 2017 at 05:55 PM.
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    SkippyGU JackCollo's Avatar
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    It’s not coming out of the radiator cap it comes out of the 2 overflow bottle the one underneath the main one


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    Currently own a ZD30 2000 GU patrol with a dead injector pump about to start a build on a TD42 motor to go in the car and basically rebuild the whole car into a machine of a rig

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    Administrator AB's Avatar
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    Hey Jack, make sure the overflow bottle cap is on the right way too @Rossco had exact issue and it was overflow bottle cap was on wrong way so hot coolant goes into overflow bottle and cant come back to radiator so pisses out of overflow.

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    SkippyGU JackCollo's Avatar
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    Quote Originally Posted by AB View Post
    Hey Jack, make sure the overflow bottle cap is on the right way too @Rossco had exact issue and it was overflow bottle cap was on wrong way so hot coolant goes into overflow bottle and cant come back to radiator so pisses out of overflow.
    After I switch it off I can watch the water level rising then the bubble come in and it spills about 1-2 litres out


    Sent from my iPhone using Tapatalk
    Currently own a ZD30 2000 GU patrol with a dead injector pump about to start a build on a TD42 motor to go in the car and basically rebuild the whole car into a machine of a rig

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    I am wondering if its not simply a heat sink effect. The system copes when it is being cooled by circulation and cooling via the radiator, then when you stop the motor the water is exposed to the hot block and the liquid boils, hence releasing the air from the system and by default blowing the water out in front of the bubble.

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    SkippyGU JackCollo's Avatar
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    Quote Originally Posted by PeeBee View Post
    I am wondering if its not simply a heat sink effect. The system copes when it is being cooled by circulation and cooling via the radiator, then when you stop the motor the water is exposed to the hot block and the liquid boils, hence releasing the air from the system and by default blowing the water out in front of the bubble.
    Yeah it would appear that way but the odd thing is that the car doesn’t heat up at all while driving


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    Currently own a ZD30 2000 GU patrol with a dead injector pump about to start a build on a TD42 motor to go in the car and basically rebuild the whole car into a machine of a rig

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    ......... MB's Avatar
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    As ET kindly suggested Jack mate it could hopefully be as simple as a dodgey radiator cap. It has happened to me before, 1-2 litres out of the overflow bottle only upon arrival at home.
    Fingers crossed for you mate, best of luck!


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  10. The Following 2 Users Say Thank You to MB For This Useful Post:

    JackCollo (21st November 2017), the evil twin (21st November 2017)

  11. #9
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    Quote Originally Posted by JackCollo View Post
    Yeah it would appear that way but the odd thing is that the car doesn’t heat up at all while driving


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    The airflow is stripping the heat away when you are pumping it thru the radiator, when stopped it sits there and percolates.

  12. #10
    SkippyGU JackCollo's Avatar
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    Fingers crossed indeed
    So which way is the cap supposed to go. To be honest I didn’t know they had a right and wrong way

    I might do a full radiator flush ASAP


    Sent from my iPhone using Tapatalk
    Currently own a ZD30 2000 GU patrol with a dead injector pump about to start a build on a TD42 motor to go in the car and basically rebuild the whole car into a machine of a rig

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