Sounds like you covered most everything there, you may not like my answer, but before we go any further I would get the system chemically tested to find out if there are combustion gases in the coolant, if there are, it is likely you may have a bad head gasket/s or cracked head/s pumping combustion gases into the cooling system causing the overheating. Most shops have these testers as they save us alot of time/ and customers money by diagnosing the problem right, the first time. Now if you dont want to visit the shop, I have heard that some parts stores sell, or even loan out these testers, they are simple to use. Lets start there and see what we have. Hope this helps, let me know.
Wednesday, July 27th, 2011 AT 2:18 AM