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Thread: Radiator drain plug not engaging.

  1. #1
    Senior Member The Mad Hatter's Avatar
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    Default Radiator drain plug not engaging.

    Hi all! Was working on the 93 century (3300) and after draining the radiator the petcock won't engage anymore. Like whatever it screws into isn't there anymore. I had to remove it to get some trash out of the outlet to get drain flowing, maybe I knocked it out? Is there a way to fix this or am I pulling the radiator? Thanks for the help!
    1986 Chevrolet Celebrity Eurosport -- RS Transformation in process
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  2. #2
    Senior Member CorvairGeek's Avatar
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    There is a little square piece that snaps in the hole that retains the petcock. If it is missing or pushed in and broken, pull it out, if you can, and go buy a new petcock (they come together). I've changed them without removing anything. They can fail, at the thin place in the stem iof the petcock, while going down the road. I carry a spare.
    Jerry

  3. #3
    Senior Member The Mad Hatter's Avatar
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    Ha! Such a simple thing! I've never had one of those break before, so never knew you could buy them! Easy fix, completed today. Back up and running. Thanks man!
    1986 Chevrolet Celebrity Eurosport -- RS Transformation in process
    1988 Oldsmobile Cutlass Ciera XC Special Edition -- saved from the scrap heap
    1989 Pontiac 6000 STE AWD - turbo someday
    1993 Buick Century - supercharged GS (not a real one) project
    1994 GMC Suburban SLE 2500 2wd
    1997 Saturn SW1 -- The daily driver
    1978 Pontiac Sunbird coupe -- Iron Duke powered!
    1993 Pontiac Bonneville SSEi

  4. #4
    Senior Member CorvairGeek's Avatar
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    You are welcome. I took a crash course in GM plastic petcocks after ours was 'spit out' in the Costco parking lot.
    Jerry

  5. #5
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    I've always thought the plastic petcocks were not so great so I prefer to leave them undisturbed. To drain the radiator I always just undo the lower hose.

    I did have to replace one in my 92 Trans Sport, that spit out on its own. Had to follow the creek all the way home to keep dumping in water every few miles, but I got it home safe.
    1989 Celebrity CL 4 door, 3.1 MPFI, 4 speed auto, summer daily driver
    1989 Cutlass Cruiser wagon, 2.8 MPFI (future 3.1), 4 speed auto, future 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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