To find it, you'll need to consult your truck's repair manual (a Haynes or Chilton manual would be helpful) or a wiring diagram specific to your 1998 Chevy C2500. These resources will show you the exact location and will usually give alternative troubleshooting steps if the relay isn't readily visible.
Generally, you should check these common locations:
* Underhood Fuse Box: This is the most likely location. The fuse box often contains relays for various electrical components. Look for a relay labeled "blower motor" or a relay with appropriate amperage rating for the blower motor. The relay might be in the box itself, or in a separate compartment underneath.
* Passenger Compartment Fuse Box: Some vehicles also locate blower motor relays inside the passenger compartment fuse box (often located under the dash).
Before you start searching: Make sure the blower motor itself isn't the problem before jumping to the relay. Check fuses first (they're easier to access and less expensive to replace than relays). A multimeter can help test the blower motor, its circuit, and the relay itself.
Without the specific model and trim level of your 1998 Chevy C2500, a more precise answer is impossible. Use your truck's documentation or a wiring diagram to pinpoint the relay's location for sure.
