Oh and on my recent trip to ca (last weekend) the engine coolant never got above normal 210 even though the air outside was 100-110 in places.
So I'm pretty sure the larger radiator has solved my engine cooling problems.
Even while climbing the mountain passess with the a/c on the engine temp never got above normal. The trans on the other hand... well thats another story. I had to pull over twice and sit with the trans in park for 10-15 minutes till it came back down within its normal range.
And yes going threw Death Valley at or around midnight it was still hot as h.e.l.l.