Best way to flush cooling system

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Northstar Engines and System Technical Discussion Discussion, Best way to flush cooling system in Cadillac Engine Discussion; Hello all, can anybody tell me what is the absolute best way to flush a cooling sytem..The car is a ...
  1. #1
    postman2000's Avatar
    postman2000 is offline Cadillac Owners Fanatic
    Automobile(s): 1996 STS 2000 Deville
    Join Date
    May 2009

    Best way to flush cooling system

    Hello all, can anybody tell me what is the absolute best way to flush a cooling sytem..The car is a 96 STS and it has a bunch of caked up reddish crap at the top of the radiator and on the radiator cap..Is the old garden hose method the best or do the power flush coolant exchanger machine thingies work better? Any info is greatly appreciated...Thanks much..

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Best way to flush cooling system

    That "reddish crap" is cooling system supplement aka sealant tab residue. Best to just drain and refill with 50/50 Dex/distilled water. You'll never get all the coolant out, thus if you flush it, you'll never get all the water out and getting it back to a 50/50 mix can be a PITA.

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