Dart Running Hot?

Ditto on AC vs non-AC water pumps. The reason for the difference is that AC cars used different pulleys so the w.p. turns at a different speed. They actually have fewer blades (recall 6 vs 8 for non-AC car). Each is optimal for the speed they turn.

Installing a 180 F T-stat will not make it run cooler. A 195 F T-stat would be full-open at 210 F too. In winter, it may run cold w/ the 180 F T-stat, giving poorer mileage, more wear, and more emissions.