Well, I don't know how hot is in Arizona, but it gets pretty hot standing in traffic for 30 min, without moving, at 40*c (in the shade). Humidity is also very high.

__________________
1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.