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    Block drain plug 3.1

    I want to get the dex cool out of my century. Is there a plug I can drain the block? 2000 3.1

    #2
    I don’t believe so, except freeze plugs which I wouldn’t mess with. What I like to do is remove the thermostat, put the housing back on. Disconnect the radiator hoses and blow water through both ways with a garden hose. Through the radiator too. Can also disconnect the hose to the heater core up front and blow water through there too. Stick the hoses back on, fill it up, run it for just a little bit to stir it up, drain it again. Once it comes out clear, I physically blow on the hoses and push most of the water out. Then put it all back together and fill up with your choice, I prefer the original green.
    1989 Celebrity CL 4 door, 3.1 MPFI, 4 speed auto, summer daily driver
    1989 Cutlass Cruiser wagon, 3.1 MPFI, 4 speed auto, special summer ride
    1996 Cherokee XJ 4 door, 4.0, 5 speed, winter daily driver & towing vehicle
    1991 Tracker 2 door, 1.6, 5 speed, needs work
    Previously several Celebritys, 6000s, & 2 U-vans

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      #3
      Thoroughly flush all parts of your engine, radiator, heater core, everything. When you think it clean, flush it three more times just to be safe. Dexcool turns into jello when mixed with ethylene glycol.
      1959 Chevrolet Apache 31 235 I-6 SM420
      1971 Oldsmobile Cutlass Supreme Conv 350-4 V8 THM350
      1988 Chevrolet Celebrity Eurosport 2.8 V-6 Getrag 5 Speed

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        #4
        I will get that done. Thanks for the response. I’m running scared that dex is going to grenade my intake gaskets. I like green also

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          #5
          The stock plastic intake gaskets do a fine job of failing on there own, no DexCool needed, lol. When they do eventually fail, buy the steel body version of the FelPro gaskets and you will never have to worry about them again.
          -Andy

          '86 Eurosport VR coupe
          '86 Eurosport sedan
          '88 Eurosport VR coupe
          '89 Eurosport wagon

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            #6
            Dexcool has nothing to do with gasket failure. Its just the nature of the beast on the 3100/3400.
            Brian - Carpe Diem

            I dont have to love my president, or any god, to love my country!!
            More people have died in the name of "God" than in all wars combined thruout history
            01 Pontiac Aztek GT AWD 127k - 04 GMC Envoy SLT XUV 193k

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              #7
              Originally posted by Pontiac6ksteawd View Post
              Dexcool has nothing to do with gasket failure. Its just the nature of the beast on the 3100/3400.
              It's not even really due to the 3100/3400 design. It's simply due to the plastic bodied gaskets. All the heat cycles do them in. All GM engines in the 90's-early 00's with plastic bodied gaskets had failure issues.
              -Andy

              '86 Eurosport VR coupe
              '86 Eurosport sedan
              '88 Eurosport VR coupe
              '89 Eurosport wagon

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