crimsone96Q45 wrote:ok but would that still make the engine run hotter than ussal ?
If the fan clutch is locked up, it runs at full engine speed, all the time - which wouldn't make the engine run hotter. If anything, it might run a tad cooler.
If the clutch is slipping, it would definitely make the engine run hotter.
If you're going to be replacing a cracked fan, you might consider replacing the clutch at the same time. They tend to degrade over the years - They slip more and more, resulting in slower fan speed for any given engine speed.
Don't scrimp on a cheap replacement clutch - The Nissan/Infiniti replacement part is more expensive, but definitely worth it.