To find the specific relay(s), you'll need to:
1. Consult your owner's manual: This is the best resource, as it will have a diagram showing the location of all relays and fuses in the PDB.
2. Use a wiring diagram: A wiring diagram specific to your 2001 Ford Excursion will show you which relay(s) control which AC components. You can usually find these online through auto parts websites or repair manuals.
3. Look for labels: The relays in the PDB often have labels indicating their function. Look for labels mentioning "A/C," "compressor," or "blower."
Important Note: Working with electrical components requires caution. Disconnect the negative battery terminal before working on the PDB to prevent accidental shorts and damage.