Electric fan????

A 34 amp alternator may not be up to the task like at night in the rain with the lights, heater or A/C, wipers and the Fans on is what i am trying to say.
Dave, you have an excellent point. A better scenario might be if you're stuck in traffic on a blazing hot day. That's the situation I was in last summer, and why I started thinking about the electric fan project.

That was the only time the Dart came close to overheating. It was in Houston at 5:30pm on a side street near an interstate. Road construction forced the divided four lane road down to a two-lane. 96 degrees, and over 100 miles from home. No fan shroud and only the little four-blade fan. The gauge was almost pegged, and I couldn't even get to a parking lot.

If that ever happens again, it would be the perfect test of my new setup. But I'd rather be in something with air conditioning.