I tried the 14" perma-cool fan on my car. I installed mine during the cool months of fall time. I worked fine through fall, winter, and early spring. Once summer time was nearing I noticed my temperature was slowly climbing. Then during summer it would spike into the red part. I took off the perma-cool and went back to the stock unit. Never had that problem ever since. After the perma-cool sat in the hatch for almost a year I threw away in the trash. I wish I would have kept it. I could have sold it to someone, or just put it back on during the fall and winter. You have to understand that here in San Antonio, Tx. it gets hot as hell during the summer. It's 100+ degrees everyday, so that fan could not keep up with stop and go driving. Those fans usually work for those that live in a milder climate. That's my experience with it. Others have had success with them.
Something else I've noticed was the perma-cool does not draw nowhere near the airflow as the stock set up. When the car would warm up enough to kick on the fan, or activate the fan clutch you could tell the difference big time. That prolly explains why it didn't work that well for me. 2950 cfm numbers sound great on paper, but when it's on your car while you're at a stoplight in 105degree summer heat that number doesn't seem to perform to good. Like I said, that was my experience. Hopefully you'll have better luck with yours if you decide to go that route. Good luck.