[bstock1962]

Sean, I have a laser thermometer now. It's only 87 degrees outside right now (and the stock gauge is now only going 2/3 way) so obviously my measurements are showing cooler. Therm housing is 220, top of radiator is 219, bottom of radiator is 192. I need to measure during the heat of the day tomorrow when it should be 100.

Stocker, The fan blades are positioned half way within the shroud. It's a 7 blade clutch type fan and pulls air into the engine area. Pressure cap is 14psi. I haven't been losing coolant so not sure an overflow tank would help? See attached picture.

Run GMC, the AC is working well until the engine gets too hot and everything starts to bake.