Hey you guys, i hope you may be able to point me in the right dierection, my dad has a 2000 impala with 250,000kms, and it is very very slowly looseing coolent, we already replace the head gasket, I was hoping an olds guy might have an idea, nobody replied to my post on the chev site, and I cant seem to find it again.

it is also rough when idleing

 

Checked for the obvious like bad radiator cap, hole in overflow bottle, and visible wet spots after parking for a while? How about freeze plugs leaking?...Could be a cracked head too that causes trouble only when warm...This kind of problem is sometimes hard to pinpoint.....Good Luck

 

Thanks for the reply, I couldn't find any leaks, but i guess i new rad cap won't hurt, I will check the reast when I get some more room in my garage.