got a 2001 Grand Cherokee 4.7 auto well it daughter. Well I change the lovely radiator (I highly recommend it for everyone)we still having a few issues the main one is has a hole in the vc on pass side just alittle to the right of the center vc bolt.. question is what would cause this? it look it took a hit from the inside of the cover? now it been running rough a day after I install the radiator... surely that didn't cause it to run ruff? could it be a valve spring that broke? the other thing is the hyd fan turn slow do I need to bleed it or something? thanks for any help or info!!!