Our home (this was like this when we moved in) has fan in the attic that draws air from the garage space upward (the warmest air in the garage). The garage doors, which are insulated, face north and have had screened intake vents installed low (drawing in the cooler air on this side of the home). The fan is operated by a timer (like the type that are used to run a bath exhaust) and can be set to operated for up to an hour.
This system helps remove the heat brought in by motor of the car or golf cart.
Improvements to this system could include ducting the air that comes from the garage thru the attic and directly outside thru a roof vent, rather than just ducting it into the attic space. I have vents for the attic, but it just seems to me the best use of they existing equipment would be to direct it outside.
Good Luck and keep us informed on how you solve your issue.
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