Quote:

Dan,
Do you have a leakdown tester? If so, you can see if the head gaskets are sealing correctly. Another way to check for this is to use a chemical indicator fluid that changes color if combustion gases are entering the cooling system. A company called Lisle Tools makes an inexpensive combustion leak detector kit (P/N 75500).
Even if either of these tests aren't positive, at least you've ruled them out as possibilites.



Nice to rule thes out but if the vehicle is getting hot only after shut then cylinder pressure should not be the cause.