On Saturday, June 13, 2020 at 12:07:32 PM UTC+8, Steve W. wrote:
>
> About the only way I have gotten any success with a core clogged with
> stop leak was to use a flush gun and blast it in reverse, even then it
> wasn't a big success but the core did provide some heat.
> The one I have uses shop air and water to generate pulses of pressurized
> water to break up crud and flush it out. It's a twin to the OTC 6043
> but I've had it for a long time..
>

He took it to a radiator workshop. They flushed it with their rig.
Now it is lukewarm, so half the tubes are still probably blocked.