Im having overheating problems with my newly swapped truck. 1994 gmc 4x4 sierra z71 with 2004 gmc 2x4 2500hd 6.0/4l80e. I used the factory rad and connected the steam hose off the tb too the expansion/overflow bottle about 6 inches away from where it comes in the top of tank fitting(not the vent). Is that not a good place to put it? I'm thinking it might need to be basically under the top fluid level so that when it burps air the air goes up and escapes, and when it cools down it sucks water into the heads. It may be sucking air into the heads the way i have it now causing an air bubble to form everytime it cools down. And in regards to the horizontal seam at the middle of expansion tank, can someone please tell me when theirs is in relation to the top of the rad? I can see a problem occuring if i had it too high or low.