Run it with no fan, if it's hot fit the fan and cut a little vent in the body to allow air in and to make room for the fan. My fan fitted but was flush with the body leaving no room for air flow so I cut a fan sized hole in the body which lets it draw in cool air. Being on top of a two wheel drive and racing on grass it only gets a very few small pieces of grass in it which I brush out between races any way.
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