[Capri306]

#1. The Blue Oval Lounge isn't the forum for this kind of question. It belongs in the proper Ford Tech forum.

#2. The defrost function (in most vehicles) cycles the a/c compressor on. Therefore, the electric fan for the a/c condenser will kick on to get rid of that heat. While you may get a temporary cooling effect from the fan kicking on, you will end up creating more load on the engine, and thus create more heat. The hot air coming out of the duct is cooled by the a/c system to dry it before it is heated by the heater core. You're basically running the air conditioning system. I could liken this to running a window a/c unit in the middle of the living room: sure it's nice (for a while) in front of it, but eventually the room will become unbearably hot.

Moral of the story: if you want to shed more heat while standing still, there are more efficient ways to do it. A larger radiator and adjustable fan thermostat would be good to start with, but I would be very reluctant to put a cooler thermostat in it. This would cut down on engine life and efficiency. IMO, your vehicle should NEVER have a problem standing at idle in traffic, even on the hottest days. It's a car made in 1995, not 1932.