Holstein Blower Motor Resistors are direct OE replacements for these critical interior heating and AC system components, offering perfect fit, form, and function for flawless operation that restores your vehicle to factory levels of performance. Blower motor resistors are responsible for changing blower motor speed in response to dash control movement; a non-functioning or erratic blower motor is often a symptom of a bad or failing blower motor resistor. Precision engineered sensors - manufactured from premium materials - exactly duplicate the function of the OE component, ensuring precise fan speed control for your vehicle. OE matched connectors and terminals, made from premium materials, are used to ensure an accurate, easy connection to the vehicles wiring harness. Backed by Holsteins 3 year/36K mile - we believe in our parts and our shows it! Arrives packaged in a Zip-Loc style anti-static bag that protects the electronic circuitry and components.