THey need to do a few things.

First of all, ask them to take the car to shampoo place, they put this coating on the front, above the engine to keep the engine cool.

Secondly, I saw a few liquids at some mechanic stores that they use in the radiator to keep the engine cool, instead of using water. BMW and Mercedes has this kind of Liquid coolent, I dont know if it will work for maxima. These fluids keep the radiator really cool. Check them out.

Una palabra no dice nada, Y al mismo tiempo, Lo esconde todo - Outlandish