need a thin 16" electric fan

I'm going back to electric fan. I just can't get any heat in the motor with a flex fan. It wants to run 155 to 165. It will slowly and I mean slowly heat up if it idles in hot weather for a while. I ran dual smaller fans last time and they restricted pretty much all the air flow unless they were on. I had to run them at 55mph. I want the fan to clear the water pump pully so it needs to be 3 1/4 inch and I want some cfm. Probably at least 2500. Any suggestions?