If your van has the 3.8 litre engine I would bet that you probably have a blown head gasket. It was a common problem with that van. How many miles are on the van? My head gasket went with 84000 miles on the engine right after the extended warranty ran out. Even though I pulled over right away when I saw the temp gauge spike it was too late 4000 worth of engine damage. I must say though Ford did the right thing and purchased the van back from me.