I have two defrost fans top oppsite ends of windshield, and two fans in the rear area. None does a very good job of moving air. They turn fast, make alot of noise, but so much as to moving air.
I have removed the front units and looking for an effective fan to replace. We can tolerate the heat to 85+ if there is an air moving. The drivers side window is under neg pressure when moving, so not good for driver.
Here is a google pic of the fan I have. I believe they were pricey, but not effective. I have also tweaked the blades by increasing pitch, still no improvement in moving air.
Thanks in advance for suggestions. I was going to check out West Marine. I have a marine fan from 30+ years ago, little larger but 100+ better.