Hey smart folks!

I just ran into an overheating problem I want to run by you. On my drive back from lunch, the car began to overheat so I pulled into a church parking lot (4 miles from my house :| ) and did some quick battlefield triage. The car currently has:

* Roe aluminum radiator
* Derale 4000cfm duel fans w/ 4" aluminum shroud
* new water pump (2 months old)
* new T-stat (same as above)
* bleeder screw mounted on upper radiator hose for easy bleeds

I've been hammering on the car for a few weeks with zero issues - those massive fans and radiator combo tackle anything I could throw at it up until now. On the drive back, temps shot up from 200ish to near redline before I was able to shut it down in the parking lot. I let the her sit for a bit, and only a trickle came out of the overflow bottle. I had my wife (who was following me back from lunch) back-track and she saw no evidence of any coolant loss on the road we just came down. Sitting at idle, it will jump from 230+ to approaching red very quickly. I opened the bleeder screw and depressurized the system. The upper radiator hose went slack, and I checked the main coolant bottle. It was completely full. Cranking the car up again, the upper radiator hose got hard, which tells me (I think) that the water pump is working. No steam from the exhaust side/smell of burning coolant for headgasket. Fans are still going full tilt, so I don't think it's an electrical problem. No other visual signs of a leak anywhere - no puddles (save for a small one near the front nose corner, which I believe is where the dump tube goes from the main tank. It's just...odd.

I've reached the extent of my limited knowledge, and now defer to the smart folks here I'm going to let it cool down all the way and go back with an extra bottle of coolant just in case -- if I can limp her home the 4 miles I can do way more investigative work..but I won't risk driving if it gets those massive spikes again.