NO SLO PK, I agree that a 160 could help cool it off, but the opposite can be true, too. It's kind of a fine balance. It all depends on how efficient the radiator is and how hot the engine is getting.
Are you saying that when you're in heavy stop-and-go traffic, on a 95 degree day that your engine runs cold?
One thing that caught my eye in a magazine recently was the fact that electric fans are no good above a certain amount of HP. I think it was like 350. They just can't blow as hard as a mechanical. My guess would be that the original fan clutch was not working and the fan was just free wheeling. Going to a police duty clutch might help a lot.
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351W 89 Mustang GT Convertible