Ok, 6 weeks ago after the truck had been running about 10 minutes I noticed a coolant leak. Could'nt find it but it appeared to be coming from the overflow tube on the coolant canister. It had stopped and the next morning after sitting all night in 40 deg weather I took the cap off and there was a-lot of pressure in the system. I took it to the dealer claiming excessive pressure in the cooling system. They told me that it had an air bubble in the cooling system and they bleed it out. The coolant light had come on a couple of days afterward and I took the cap off in the AM and it still had a little pressure. It did this a couple of more times. I thought maybe it may have been bleeding a little more air out making room for more coolant. Well yesterday the check coolant light came on and I thought no big deal well then the check temp came on and the gauge said 250 deg. I pulled over and it took a lot of water. I have called the dealer and they have not called me back but does this sound like a blown head gasket? I have seen no more water leaks of steam?