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500, 472, 425, 368 Discussion, best way in Cadillac Engine Technical Discussion; Hello, I have a 1980 deville, 368, what is best way to flush cooling system to flush block and rad ...
  1. #1
    creeker is offline Cadillac Owners Connoisseur
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    best way

    Hello, I have a 1980 deville, 368, what is best way to flush cooling system
    to flush block and rad too ?. tx Ken

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  3. #2
    terrible one's Avatar
    terrible one is offline Banned
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    Re: best way

    Firstly, I think they make a chemical made to clean out the block's cooling passages. With that being said:

    Disconnect rad hoses,
    Remove rad (if you want to get it rodded out or something)
    Coolant will come rushing out
    Stick a waterhose in the lower hole and let it get what's left out.

    Then,

    You can either put it all back together with new coolant, or if it has a lot of dirt/rust/corroding or whatever, you can put some stuff in there designed to clean it out, and drive around for a bit like that (instructions should be on the bottle) and then you put regular coolant in.

    That is how I would do it at least.

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    burnrubber is offline Banned
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    Re: best way

    IN the truck shop I used to work at - we'd use Cascade detegent to flush cooling systems. Run them for an hour or so - then drain them. Shoot water through the upper inlet on the radiator - and if your water pump is off, shoot water through both ports on the engine.

  5. #4
    burnrubber is offline Banned
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    Re: best way

    OOps. I meant detergent.

  6. #5
    creeker is offline Cadillac Owners Connoisseur
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    Re: best way

    Thank you both for your advice, also burn rubber, how much cascade det. would you use?.

  7. #6
    burnrubber is offline Banned
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    Re: best way

    I'd use probably a cup or so with a car cooling system (I am talking of the powder detergent). Run that with water and drain it. Do that till you think its clean. Then run straight water through it till it comes out clean. Its a little time consuming but it seems to work well - better than those bottles of radiator flush.

  8. #7
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    Re: best way

    I flush my systems with the heater on and water circulating thru that system as well. Also dosen't hurt to run the heat once or twice during the summer months so that those lines don't sit stagnent.

  9. #8
    creeker is offline Cadillac Owners Connoisseur
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    Re: best way

    Thanks for the good advice.

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