S1 405 Mi16 cooling system bleeding
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  1. #1
    Member franco's Avatar
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    Default S1 405 Mi16 cooling system bleeding

    I'm going to attempt bleeding the cooling system on my vehicle tomorrow, and want to do it right first time

    I've replaced the heater hose (going from the thermo to firewall), and Mark from Lion Auto advised me on his method of bleeding: Fill the rad core to the top, undo the bleeder screws at both the top of the thermo cover and the coolant pipe that runs along the back of the engine (parallel to the rocker cover), then run the engine and as soon as coolant runs from the thermostat sans air bubbles, tighten, then followed by the next bleeder.

    Is this correct? I thought (reading other posts) that 'other' bleeders need to be undone, such as ones on the radiator itself. Me confused

    Are the bleeders on the rad the black plastic screws with the 'tab'? I tried unscrewing one tonight and appears to just keep turning (located on the top left hand side [passenger])

    Any guidance as to clear step-by-step procedure much appreciated.



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    1991 Peugeot 405 Mi16 sports saloon
    Boge shock absorbers all round
    K&N panel
    FOR SALE: $4800 NEGOTIABLE
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  2. #2
    Fellow Frogger! Dijon16's Avatar
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    It helps to face the vehicle uphill so the radiator cap it the highest point. There’s 4 screws – top of the radiator passenger side (plastic knob half a turn, it does not ‘unscrew’ as such), top of the thermostat housing is a very fragile one, side of thermo housing is an allen key one, and the coolant pipe.

    The method I have been advised of is to run it until the fans come on, coolant will expand and rise significantly, so progressively tighten the screws as the coolant comes out, from rear to front. I forget if the rad cap should be on, I am sure someone here will reply.

    Word of warning, the screw on top of the TH will split the housing of done up more than finger tight.

    Chris
    "all care, but no responsibility"

  3. #3
    1000+ Posts PeterT's Avatar
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    Leave the cap off and drive it around the block.

    '92 205 Mi16
    '90 Mi16x4

  4. #4
    Member franco's Avatar
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    Quote Originally Posted by PeterT
    Leave the cap off and drive it around the block.
    Are you being serious Peter?

    If so, run it to the temp where the thermostat opens (88 degrees I assume)? Then thats it?

    Seems all too simple
    1991 Peugeot 405 Mi16 sports saloon
    Boge shock absorbers all round
    K&N panel
    FOR SALE: $4800 NEGOTIABLE
    http://www.aussiefrogs.com/forum/showthread.php?t=32141

  5. #5
    Member franco's Avatar
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    Quote Originally Posted by Dijon16

    Word of warning, the screw on top of the TH will split the housing of done up more than finger tight.
    The thermo screw has been replaced with a brass allen head screw thankfully!
    1991 Peugeot 405 Mi16 sports saloon
    Boge shock absorbers all round
    K&N panel
    FOR SALE: $4800 NEGOTIABLE
    http://www.aussiefrogs.com/forum/showthread.php?t=32141

  6. #6
    Moderator Alan S's Avatar
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    Quote Originally Posted by franco
    The thermo screw has been replaced with a brass allen head screw thankfully!

    They're the ones he's talking about that split the housing if screwed in too tight.


    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  7. #7
    1000+ Posts PeterT's Avatar
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    No I'm not really serious, but that's what the radiator people do! Just undo the two screws - thermo housing and heater bypass pipe (behind head).

    '92 205 Mi16
    '90 Mi16x4

  8. #8
    Fellow Frogger! John505's Avatar
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    If you are doing it with the car on level ground then you need a cone shaped plastic shape (cut off old container) to shove into the top of radiator so that you can fill the radiator with coolant that is at a higher level than the thermostat bleed screw & the bleed screw on the rubber hose line adjacent to it (as outlined in Haynes manual). I've previously done it this way instead of facing car uphill - clever!
    The better bleed screws are the brass ones - as you all say, the plastic screw on thermostat is fragile. I open these two first & leave the radiator bleed (on far right hand side of top of radiator as you face it) till last. Run the engine & after there is a constant stream of coolant coming from the uppermost bleed screws close them gently. Then do the radiator bleed.
    Important to do - or you can fill radiator fairly full, drive car for twenty minutes & leave till following day & top up when cold! The less correct & elegant solution.
    John505

  9. #9
    Member franco's Avatar
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    thankyou all for responses, will attempt now.....
    1991 Peugeot 405 Mi16 sports saloon
    Boge shock absorbers all round
    K&N panel
    FOR SALE: $4800 NEGOTIABLE
    http://www.aussiefrogs.com/forum/showthread.php?t=32141

  10. #10
    Member franco's Avatar
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    Success first time round, couldn't of been any easier!

    Who ever said Mi16's were hard to bleed!

    Thankyou to all who responded to my queries

    1991 Peugeot 405 Mi16 sports saloon
    Boge shock absorbers all round
    K&N panel
    FOR SALE: $4800 NEGOTIABLE
    http://www.aussiefrogs.com/forum/showthread.php?t=32141

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