To find it, you should:
1. Consult your owner's manual: This is your best bet. The manual will show a diagram of the fuse box and usually list the blower motor fuse and relay location.
2. Locate the underhood fuse box: This is usually a large black box, often near the battery or firewall.
3. Examine the fuse box cover: The inside cover often has a diagram labeling each fuse and relay. Look for terms like "blower motor," "heater," or "HVAC." The relay may be labeled with its amperage rating.
4. If the fuse box diagram doesn't help: Look around the fuse box area for any additional relay modules or junction blocks. The relay might be mounted on one of these.
5. Use a wiring diagram: If you can't find it visually, a wiring diagram for your specific year and model Park Avenue will show the location and path of the blower motor relay. You can often find these diagrams online through automotive repair resources.
Remember to always disconnect the negative battery terminal before working with any electrical components.