Where is heater relay on 1991 Chevy pickup 1500?

On a 1991 Chevy pickup 1500, the heater relay is typically located under the dashboard on the driver's side. It can often be found near the blower motor or behind the fuse panel. To access it, you may need to remove some panels or trim pieces. Refer to the vehicle's service manual for precise details on the relay's location and identification.