What must you do before installing an LKQ radiator?

Before installing a like-kind and quality (LKQ) radiator, the appropriate step is to flush and charge the cooling system. This process ensures that any old coolant is removed, contaminants are eliminated, and the new radiator operates efficiently with the appropriate type and amount of coolant. Flushing helps maintain optimal performance and prevents future issues related to overheating or blockage.

While inspecting for leaks, painting surfaces, and replacing hoses may also be important maintenance steps in certain situations, they are not a prerequisite for the installation of the LKQ radiator itself. Flushing and charging specifically addresses the readiness of the cooling system for the new component, thus making it the most critical action before installation.