* Under the hood in the fuse box: This is the most common location. The fuse box is often located near the battery. Check the diagrams on the inside cover of the fuse box. Look for a relay labeled "blower," "AC," or something similar. The diagram should show its position.
* Under the dash: Less common, but possible. You might find it in a smaller fuse/relay panel under the dashboard, possibly near the steering column. Again, a diagram on the panel cover would be helpful.
To find it definitively:
1. Consult your owner's manual: This is the best starting point. The manual should have a diagram showing the location of all fuses and relays.
2. Check the underhood fuse box diagram: Even without the owner's manual, the diagram on the inside cover of the underhood fuse box is crucial.
3. Use a wiring diagram: A wiring diagram specific to your 1997 Chevy K1500 (available online from repair manual sites or forums dedicated to this truck) will show exactly where the blower motor relay is connected in the vehicle's electrical system.
Important Note: Before you start messing with relays, be sure your battery is disconnected to prevent electrical shorts. Also, if you're not comfortable working with car electrical systems, it's best to take your truck to a qualified mechanic.
