98 S70, N/A Replacing broken radiator drain petcock Topic is solved

[FireFox31]

I recommend not opening the radiator petcock. I have the hose barb petcock, part 3547226. Mine snapped when I tried to open it so I had to replace it.

The flow rate from it is terribly slow. I loosened it enough to drain and it was wobbling around in the socket, letting coolant come out its threads. I drained the radiator much faster by removing the lower hose carefully over an old 2 gallon paint bucket placed immediately below. Sure some coolant splashed, but at least it drained in 7 minutes instead of much longer through the petcock.

Since you're doing the timing belt and other work on your car, consider replacing the coolant hoses and clamps as a preventative. Yours looks as swollen as mine. The new ones are nice and flush with the clamps. And get the OEM clamps because they're really high quality with rounded edges to not cut into the clamps.