Originally Posted by ehall
Best way I've found is install a tee fitting from the flush kits at the highest point in the heater hose and fill from there. Also makes draining faster, just open the petcock and turn the screw-on cap to release pressure.
Good idea. One thing to keep in mind is many of the GM OEM replacement radiators do not have petcocks- you to have pull the lower radiator hose to drain the coolant.....