$2200 later, still running to hot!

[Cazzzidy]

Hey guys,

I am really, really angry. Really, really, really angry.

I payed $5500 for a supposedly "perfect" 300D. With 100,000 original miles.

Well, so far I have spent $500 repairing oil leaks, and now, $2200 chasing a slight over heating problem.

Anyway, the car is running at 92-97C constantly, in light driving in cool weather. It almost hit 100C when climbing a long hill. It doesn't ever run hotter than that.

List of recent fixes:

-Replaced thermostat three times
-Replaced temp sensor and wiring
-New BEHR radiator
-Replaced headgasket (old headgasket had coolant leaks, and leak between two cylinders)
-Water pump is in excellent condition
-Water pump housing is not pitted, in excellent condition
-New fan switch (turns on at 100C)
-Has good compression and passes coolant pressure test (when cold at least)

My mechanic thinks that the head or block has a pinhole or crack.

I don't know if I am willing to spend any more money on this problem right now, so I am looking for low cost solutions. How about a fan switch that comes on at 80C? How about a "fix leak" product? How about running without a thermostat?

Cassidy