I have a 70 Dart, 318, auto, with AC. It has a 22" inch 2 row radiator , 19 inch HD clutch fan, 180" thermostat, 50/50 mix. The other day, about 85 degrees, going down the interstate at 70 mph and 2500 rpm I was running about 215 degrees. At 75 mph it went to 225-230. At 55-60 it runs about 200-205. Temperature has been verified with a new mechanical gauge. I took the rad cap off and dropped the sensor in the radiator and the thermostat opened right on 180. I let the car idle and there seemed to be plenty of flow through the radiator, the clutch fan seemed to working, and the temp continued to climb till I shut it off at 215. Outside temp was about 75. Running the aftermarket AC only seems to make a little difference. I know I need to find a shroud but I would think even my setup shouldn't be running this hot. Any ideas? Thanks in advance.
