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Bleeding system

This is a discussion on Bleeding system within the General Help forums, part of the LSx Technical Help Section category; And what are these? I have heard of the coolant by pass mod but i dont know if this was ...

  1. #21
    Member zeetwentyeight's Avatar
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    And what are these?
    I have heard of the coolant by pass mod but i dont know if this was done to it or not? here is some pics


    I aloso need to know which line will bleed the sytem




  2. #22
    Senior Member Orcus79's Avatar
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    Looks like the bypass mod has been done, other wise ther would be two rubber hoses attached to those connections. Sounds like air in the system and possible clogged rad, taka a hose a carefully back wash the fins and check to make sure you don't have a build up of debris between the ac condensor and rad.

    An easy way I ahve heard of bleeding teh system is to take teh rad cap off (when cold) then run the engine till the stat opens and shut it down, add ing coolant when it cools and the water elvel drops.

  3. #23
    Member zeetwentyeight's Avatar
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    Quote Originally Posted by Orcus79 View Post
    Looks like the bypass mod has been done, other wise ther would be two rubber hoses attached to those connections. Sounds like air in the system and possible clogged rad, taka a hose a carefully back wash the fins and check to make sure you don't have a build up of debris between the ac condensor and rad.

    An easy way I ahve heard of bleeding teh system is to take teh rad cap off (when cold) then run the engine till the stat opens and shut it down, add ing coolant when it cools and the water elvel drops.
    I have done that with the radiator cap.
    My Heater core had a leak last week and i got it replaced,
    also flushed the coolant last night and replaced radiator cap.
    I THINK there is possably a air pocket in the cooling system.
    What is the point of the coolant bypass mod any way?
    Wouldn't it be cold fluid running through the TB?
    Making the air denser?

  4. #24
    Senior Member Orcus79's Avatar
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    nope, its hot coolant running through there, as the lines that are connected to it are also known as steam lines, venting any steam along with hot coolant. Its to keep teh Tb from iceing up in extream cold.

    The Tb bypass takes the TB out of that loop, removing the heat and keeping the incoming air cooler.

  5. #25
    Member zeetwentyeight's Avatar
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    Quote Originally Posted by Orcus79 View Post
    nope, its hot coolant running through there, as the lines that are connected to it are also known as steam lines, venting any steam along with hot coolant. Its to keep teh Tb from iceing up in extream cold.

    The Tb bypass takes the TB out of that loop, removing the heat and keeping the incoming air cooler.
    Thats what i was thinking it makes more sense.
    So how do i bleed it?

  6. #26
    Single Malt rbob93's Avatar
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    Quote Originally Posted by zeetwentyeight View Post
    Thats what i was thinking it makes more sense.
    So how do i bleed it?
    Open the lines that used to be hooked to the throttle body & slowly fill the system until all the air escapes.
    Make sure there is no obstruction to the radiator ie. plastic bag stuck on it or debris in the fins.
    Air dam must also be installed on these cars

    For what it's worth.....the bypass mod is a crock IMO.

  7. #27
    Member zeetwentyeight's Avatar
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    Quote Originally Posted by rbob93 View Post
    Open the lines that used to be hooked to the throttle body & slowly fill the system until all the air escapes.
    Make sure there is no obstruction to the radiator ie. plastic bag stuck on it or debris in the fins.
    Air dam must also be installed on these cars

    For what it's worth.....the bypass mod is a crock IMO.
    I cant see where those lines would be.
    Where would they be at?

  8. #28
    Moderator Cutlass's Avatar
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    here's a TB coolant bypass picture for reference I got from another site. Ignore the words

  9. #29
    Member zeetwentyeight's Avatar
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    So should i disconnect it and run it till straight fluid comes out?

  10. #30
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    Also make sure the factory airdam is still under the car (black bottom scraper) because it pushes the air to the radiator or you will overheat while driving.

  11. #31
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    yes.......on the right side of the TB disconnect the hose that runs to the TB ......or in you have had the TB mod....to the radiator......when its disconnected fill the rad up until coolant comes out of the pipe......reconnect line......continue to fill rad.....when topped off.......start engine and run heater full blast .......leave rad cap off and top off as needed til it gets hot enuff to overflow....DONE......if this dont get the air out recheck the stat........i did the bypass mod......no problems here

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