loosing coolant thru radiator cap

[PKRWUD]

Originally posted by blk88lx
What do you mean by flush?

Make sure that the top lip of the fill spout, where the cap seals, is perfectly flat all the way across. Use a straight edge if necessary. Often what happens is someone pushes a little too hard when they are tightening the cap, and one edge of the lip gets bent down slightly, making it difficult for the cap to completely seal, or to lose it's seal at a much lower pressure than the cap is rated for. You need to check that lip and make sure it's not bent at all.