Q: How to diagnose and address issues with the blower motor and related components on Hyundai Elantra?
A: For diagnosing and addressing issues with the blower motor and related components, follow these steps. If the blower motor doesn't work at any speed, disconnect its electrical connector, connect a test light between the terminals, turn the ignition on, and set the blower switch to High; if the test light illuminates, the power and ground circuits are fine. Proceed to check the blower motor itself. If the test light doesn't come on, consult wiring diagrams to identify power and ground terminals, then check fuse, blower relay, and wiring. If the test light worked in the first step, use an ohmmeter to test ground continuity. For blower motor resistor-related issues, if the motor works on some speeds but not all, disconnect the resistor's connector, measure continuity between indicated terminals; replace if resistance is incorrect. If the issue persists, inspect air conditioning and heater control assembly for switch-related problems. For blower relay, high relay, and power transistor concerns, disconnect electrical connectors from relays, measure continuity between terminals, replace relays if resistance is incorrect. If relays are fine, proceed to check the power transistor. If all components check out but the fan motor still malfunctions, inspect the blower switch terminals, relays, and power transistor, tracing wires for continuity. For replacing components, follow specific instructions for each: blower motor resistor, blower motor, blower relay, high relay, power transistor. For 2017 and later models, removing the glove box, instrument panel bezel, air duct, and disconnecting the electrical connector from the relay or power MOSFET is necessary. Remove mounting screws, replace the component, and reverse the removal steps for installation.