This is a hooooot ride, and thats no good!
Heat
The car becomes more heated the more you use it often, if it overheats the car will stop, heat can be dangerous in the worsts moments.
The heat of the car rises faster the more things (boosters/weapons) are installed.
People might want to steal your radiator to sell it,
For comical purposes in more junky places some people might carry radiators around as flasks.
Watercooler
Regular cooler, car heat rises normally and goes down quickly.
Coldonecooler
Must be every now and then be served a beer to keep fuctioning, heat rises more slowly and goea down quickly.
Nuclearcooler
Heat never goes up, if the car breaks it will detonate into a big explosion after a couple seconds.