Posted by Willy-N [72.171.192.121] on Tuesday, July 07, 2015 at 14:59:22 :
In Reply to: Almost the same with a heater core posted by Bob in N. GA [71.28.171.205] on Tuesday, July 07, 2015 at 14:50:11 :
On my first PW and M37 I cleaned out the system using my fire pump. I did not crank it up but ran around 45-50 GPM at very little pressure. It cleaned out everything including the block passages.