Hi Mick, so many of the aftermarket fans don't move enough air to do the job. Not only that, but the "shroud" they use impedes the airflow through the radiator while driving too. Hopefully the shroud mod will work for you. Be sure to get a good 7 blade fan too. I used a fan clutch on mine but some prefer to not use one. Be sure the fan goes about 1/2 way into the shroud when installed.