how do i drain all of the coolant out
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1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, how do i drain all of the coolant out in Past Cadillac Vehicle Discussion; Hi I am new here I'm trying to do a blue devil treatment and I can't get all the coolant ...
  1. #1
    Billybeme is offline Cadillac Owners Member
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    how do i drain all of the coolant out

    Hi I am new here
    I'm trying to do a blue devil treatment
    and I can't get all the coolant out, the petcock is open there's still coolant in the res.
    any idea's

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    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    If the coolant isn't draining from the surge tank, something's clogged. I assume other stop leak products have been dumped in?

    Not only will Blue Devil not work (the gaskets aren't the issue, it's pulled head bolt hole threads, the breach is ever moving and widening), but it will create more clogs, and make repair nearly impossible.

    How did you diagnose the HG problem?

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: how do i drain all of the coolant out

    By the way, you CAN'T get all the coolant out unless you hold the car upside down and shake it.

    Return the snake oil and put the money towards a proper repair or another car. Anything else is a waste of time, effort and money.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: how do i drain all of the coolant out

    Quote Originally Posted by Ranger View Post
    By the way, you CAN'T get all the coolant out unless you hold the car upside down and shake it.
    ................ and perform immoral acts upon the heater circuit hoses using a wetordry shop vac.

    There are no block side drain petcocks, so a couple of quarts remains in the block, thus the "upside down" advice.

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