How much rad fluid?

To determine how much radiator fluid (coolant) you need, first check your vehicle's owner’s manual for the specific capacity of the radiator system. Typically, most passenger vehicles require between 1.5 to 3 gallons of coolant, including the reservoir. It's important to use the correct type of coolant specified for your vehicle to ensure optimal performance and avoid damage. Always check for leaks and top off as needed.