If you are driving and the vehicle starts to overheat, turn off the air conditioner, turn on the heater and immediately pull over to the shoulder. Odds are if the vehicle starts to overheat, there is a problem in the cooling system such as low coolant, a clogged radiator or a broken drive belt or burst hose. Once at the shoulder, shut off the engine. DO NOT attempt to open the radiator cap unless the engine is off and the top of the radiator is cold. Call Us And we will help you out, or have it towed in by your A.A.A. Or your Roadside Assistance.