if your truck is plowing the top off the coolent over flow, you have a head gaset going bad! my 2000 3.0 v6 would over heat, thes run fine, then if i did not warm it up it would blow the top off the overflow. i ordered heads off odessa cylinder head off ebay for 281.00 for both sides. had a little extra work done to them and it two days in front of the house on the street is was finished. now it runs like a new .