If it's blowing coolant out the overflow at 50% of temp then that sounds like a bad head gasket. Pulling plugs and checking electrodes should confirm this. If the plug inspection is inconclusive you could use a sniffer to look for exhaust gas in the cooling system. An auto repair shop can do this for a fee or you could purchase a kit from Napa and do it yourself.

I just did another "hose of death" last weekend and took some more pics. I'm posting them to the "Hose of death" thread now. Here's a link: http://www.toyotavantech.com/forum/s...=2244#post2244 Tim