* Under the hood in the fuse box: This is the most common location. The fuse box is usually located near the battery. Check the diagram on the inside of the fuse box lid to identify the relay. It might be labeled "blower motor" or something similar.
* Inside the passenger compartment fuse box: Some models place it inside the cabin, often under the dash on the driver's or passenger's side. Again, check the fuse box diagram.
To find it definitively:
1. Consult your owner's manual: This is the best place to start. The manual should have a diagram showing the location of all relays and fuses.
2. Use a wiring diagram: A wiring diagram specific to your 2002 Chevy Trailblazer will show the relay's location and its connections. You can often find these online through repair manuals (like Haynes or Chilton) or automotive parts websites.
3. Check online forums: Search online forums specific to Chevy Trailblazers (like Trailblazer forums). Other owners may have posted about their relay location and troubleshooting experiences.
Important Note: Before working on any electrical components, always disconnect the negative battery terminal to prevent accidental shorts or damage.
