405 is drinking coolant
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  1. #1
    1000+ Posts PugMonkey's Avatar
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    Default 405 is drinking coolant

    My new addition to the family, the 405 Mi16 is drinking coolant. The previous owner put it down to a split top hose.

    ...but I fill the radiator with water and let it sit. After 30 minutes (not running) the water level has dropped considerably with no leaking fluid to be found externally.

    When I start it, i get a lovely steam cloud from the exhaust pipe after a few minutes. I am presuming this to be a failed head gasket where the coolant is leaking into a cylinder?

    The oil is clean so the water is not mixing with the oil.

    I will do a compression test tomorrow to see how it goes.

    ...any help with the diagnosis ?

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  2. #2
    Budding Architect ???? pugrambo's Avatar
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    if the level has dropped considerably then the engine would hydraulic upon starting

    have you tried bleeding the system ?

    also check inside the car for wet spots
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  3. #3
    1000+ Posts schlitzaugen's Avatar
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    I found the inside heater core was my problem. A crappy little item that seeps discreetly under the carpet until you can't sit in the car anymore, especially on hot days. By then the carpet is ruined and you can't get the stench out anymore. To check this is the problem, pull the carpet (seriously, no mercy) from under the center console, that's where the coolant ends up.

    And if you suspect the cylinders, just pull the plugs and check.
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  4. #4
    Fellow Frogger! racing405's Avatar
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    Yep, I don't believe it will be a head gasket if the coolant level drops while the car isn't running. Wherever the leak is needs to be below the low tide mark in the radiator - the head gasket is higher. If there are really no leaks externally, then the heater core is a good bet. Steam in the exhaust is curious. Maybe two problems...steam at exhaust is likely head gasket...

    Let us know what you discover.
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    1:59:09 last time at Phillip Island - less than standard Mi16.

  5. #5
    Fellow Frogger! James S's Avatar
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    Default 405

    Hmm - cracked head maybe?

  6. #6
    1000+ Posts Gamma's Avatar
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    Default Seen a nifty trick.

    Seen a nifty trick.
    A persistent leak in the cooling system could not be found so a mechanic/aircon guy tried this.

    Drain the cooling circuit and re-pressurize with R12 or other refrigerant gas, (a bit of fiddling with the water jacket pressure tester did the trick). Then poke the "sniffer" into each cylinder, engine bay and in and around the cabin looking for where it is escaping.

    (in this case it was the heater coil and the inlet manifold jacket, (eaten out)).

    Just a thought????
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  7. #7
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    Quote Originally Posted by PugMonkey View Post
    My new addition to the family, the 405 Mi16 is drinking coolant. The previous owner put it down to a split top hose.

    ...but I fill the radiator with water and let it sit. After 30 minutes (not running) the water level has dropped considerably with no leaking fluid to be found externally.

    When I start it, i get a lovely steam cloud from the exhaust pipe after a few minutes. I am presuming this to be a failed head gasket where the coolant is leaking into a cylinder?

    The oil is clean so the water is not mixing with the oil.

    I will do a compression test tomorrow to see how it goes.

    ...any help with the diagnosis ?

    ......
    Definitely a head gasket, how else would water get inside the cylinders?
    Graham

  8. #8
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    after all its a peugeot it could be all of the problems listed, or it could be somthing so simple to fix its depressing when you find it.

    i hope all goes well with your poor pug.
    cheers

  9. #9
    1000+ Posts PeterT's Avatar
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    head gasket for sure

    Quote Originally Posted by PugMonkey View Post
    When I start it, i get a lovely steam cloud from the exhaust pipe after a few minutes. I am presuming this to be a failed head gasket where the coolant is leaking into a cylinder?

    '92 205 Mi16
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  10. #10
    1000+ Posts Andrew Ch's Avatar
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    Quote Originally Posted by PugMonkey View Post
    My new addition to the family, the 405 Mi16 is drinking coolant.

    I will do a compression test tomorrow to see how it goes.

    ......
    From personal experience a compression test won't always show up a blown headgasket .....

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