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Thread: Bleeding the coolant

  1. #1
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    Default Bleeding the coolant

    Right, I'm going to finally get round to fitting the new Thermostat at the weekend! Whilst at the stealers I asked the service manager if the system (CDTi 150) was a 'self-bleed' system and he said "NO" and wouldn't tell me how to bleed it!?

    Anyone know how?

  2. #2
    Ex Vec-C Admin Ian-Highlander's Avatar
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    Vehicle : Insignia Tourer

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    Default

    He's talking out his rear end. It's a high pressure pump driven system with an expansion tank specifically designed to allow excess pressure (and air) to escape.
    "Doing a good job here is like wetting your pants in a dark suit, you get a warm feeling but nobody else notices"
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    That's what I thought

    So, I should just do the thermostat and keep filling the expansion tank whilst the engine is funning up to the MAX guage?

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    Regular Member DaveW555's Avatar
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    Default

    Yeah just fill the system up with coolant, run the engine up to temp (leave the cap off the expansion tank) keep topping up the level as necessary and put the heater on full, when the heater blows hot, do a final check of the level then put the cap back on. Turn the engine off and let it cool down overnight then check the level again, job done.

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    Midlands - Head case Organiser Dog_Book's Avatar
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    Default

    Holy thread revival!
    So if this is the way to bleed a cdti then why have I found other posts saying you have to bleed the coolant with the small screw on the pipe at the front of the engine?

    whats the correct method lol
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    Default

    cobwebs?
    what they said have you got a 150 ?

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    VIP-Member Das's Avatar
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    Default

    Quote Originally Posted by Dog_Book View Post
    Holy thread revival!
    So if this is the way to bleed a cdti then why have I found other posts saying you have to bleed the coolant with the small screw on the pipe at the front of the engine?

    whats the correct method lol
    What Ian Said.

    Quote Originally Posted by Ian-Highlander View Post
    It's a high pressure pump driven system with an expansion tank specifically designed to allow excess pressure (and air) to escape.

  8. #8
    Regular Member vmb2722's Avatar
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    Default

    Quote Originally Posted by Dog_Book View Post
    Holy thread revival!
    So if this is the way to bleed a cdti then why have I found other posts saying you have to bleed the coolant with the small screw on the pipe at the front of the engine?

    whats the correct method lol
    Leave that screw alone, it's as much use as a chocolate teapot

  9. #9
    Midlands - Head case Organiser Dog_Book's Avatar
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    Default

    Thanks boys! I'm good with mechanics but with no manual you'd assume it's a bleed screw I wonder what it's for then lol?

    well since the new stats been fitted for 3 months if assume it's already self bled so it must be faulty. I can't think that running the engine with the expansion cap off for a while would make a blind bit of difference
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  10. #10
    Regular Member vmb2722's Avatar
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    Default

    it is a bleed screw, its just pony

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