OK to run car on jackstands?

[jaykay]

Would there be an alternate method of flushing the coolant system...perhaps a pressure bleed system that would avoid you having to do this?

Make sure the car is really on those stands before starting...vibrations can make things shift over time. Are you having it sit on rubber or? You might want to weld on some jack stand pads with locking pins for the jacking points.

[Bobiam]

There are some events in life that we will remember for all of our days..... But for the sake of the rest of us, please have video running so we can share in the experience, but not the cost, as the car slips off and you experience one of the worst days of your life.

Use 2X6s to construct some 4 wheel ramps maybe 3 or so boards high so you can do this work, plus oil changes etc without jack stands. I did a coolant change with such ramps. No problem and no worry.

There's no way I'd try running in on stands. Just too risky.

[J's boxster]

+1 on the camera running! Be careful and good luck!!