Re: 4 or 6
Blade/fan performance is characterized by the following:
1. Angle of blades.
2. Speed of blades
3. Length of blades.
4. Number of blades.
As you can see from other comments that 2 blades that are designed as originally are good for cooling performance in many conditions, . You should find what the problems are first. I just wrote a small article for our club Rumble Seat Reviewer that outlined how to use an infra red thermal tool from Harbor Freight to check out your radiator temperatures before you do anything else.
Vic
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