Where is the rear blower motor relay on a 2000 Ford Excursion?

The rear blower motor relay is typically located in the rear power distribution box (PDC) in the cargo area, on the right-hand side behind a trim panel. Access usually requires removing a small panel or cover to reach the relay socket.

This article explains the exact location, how to verify whether the relay is faulty, and how to replace it if needed. It’s a common culprit when the rear climate control isn’t delivering air, and a correct diagnosis can save time and avoid chasing wiring problems.

Where to look for the rear blower relay

Rear power distribution box in the cargo area

The primary place to find the rear blower relay is the rear power distribution box mounted in the cargo area, typically on the right-hand side behind the trim panel. The box cover usually includes a diagram and labels for each relay, including a designation for the rear blower.

Alternative locations

On some Excursion configurations, the rear blower control may route through the main under-hood fuse/relay box or through a combined HVAC module. If you don’t locate a dedicated rear relay in the cargo-area PDC, check the diagram on the other nearby fuse/relay centers or consult the factory wiring diagram for your exact VIN. Always verify the label on the PDC cover to identify the correct relay.

How to diagnose the rear blower relay

Before you begin testing, ensure the vehicle is off and the negative battery cable is disconnected to prevent shorts. The steps below help confirm whether the relay is at fault or if the issue lies elsewhere in the rear HVAC circuit.

Use the following steps to locate and test the rear blower relay and related wiring.

• Remove the access panel from the rear PDC to expose the relays and fuses.


• Look for a relay labeled “Rear Blower” or a similar designation on the relay itself or on the PDC diagram.


• Inspect the corresponding fuse in the rear PDC. If the fuse is blown, replace it with a fuse of the same amperage and re-test the rear blower.


• With the ignition off, gently swap the rear blower relay with another identical relay from the same PDC (e.g., the air conditioning or another non-critical relay) to see if the blower starts working. If it does, the original relay is likely faulty.


• If swapping isn’t possible, test the relay coil and contacts with a multimeter: measure coil resistance (typical values are a few tens to a few hundred ohms depending on the model) and check continuity of the switched circuit when the relay is energized.


• Reconnect the battery, turn on the rear climate control, and listen/feel for the relay click as it energizes. If the relay doesn’t energize or click, the coil or control signal path may be faulty.


• If the relay clicks but the blower doesn’t run, suspect the blower motor itself, its ground, wiring, or the resistor/controls in the rear HVAC circuit.

In short, a non-click from the relay when the rear climate control is activated usually points to a faulty relay coil or control signal, while a click with no blower activity points to the blower motor, wiring, or resistor assembly.

Replacing the rear blower relay

If you’ve confirmed the relay is faulty, replacing it is a straightforward, component-level fix. Follow these steps to ensure a proper replacement and test.

• Order a correct replacement relay with the same part number or an OEM-equivalent rated for the rear HVAC system.


• Power off the vehicle and disconnect the negative battery cable for safety.


• Remove the rear PDC cover and gently pull the faulty relay straight out of its socket without bending the pins.


• Install the new relay in the same orientation as the old one, ensuring a snug fit and proper seating in the socket.


• Reconnect the battery, reattach the PDC cover, and restore any trim panels you removed.


• Turn on the rear climate control and verify that the blower motor operates as expected. If it still doesn’t work, continue diagnosing other components in the rear HVAC circuit (motor, wiring harness, resistor pack, grounds).

Note: If you’re uncertain about testing or replacing the relay, or if the issue persists after a replacement, consulting a mechanic or a shop with Ford wiring diagrams is advised to avoid misdiagnosis.

Summary

For a 2000 Ford Excursion, the rear blower motor relay is normally housed in the rear power distribution box in the cargo area, on the right side behind a trim panel. Locate the relay using the PDC cover’s diagram, inspect the associated fuse, and test or swap the relay to determine if it’s the source of the problem. If replacement is needed, install a correct, quality relay and re-test the rear HVAC system. When in doubt, seek professional diagnosis to rule out wiring or component failures beyond the relay itself.

Where is the blower motor relay on a 2001 Ford Expedition?

The 2001 Ford Expedition's blower motor relay is most likely located in the under-hood fuse box. If it's not there, check the area near the blower motor under the passenger side dash, especially if your vehicle has dual/auxiliary heat. The relay can also be located inside the dashboard. 
You can watch this video to see how to open the fuse box and identify the relays: 1mCarsNToysYouTube · Jan 31, 2020
Under-hood fuse box 

• Location: Open the hood and find the main fuse and relay box, which is typically located near the battery. 
• Identification: Look for a schematic on the underside of the lid that identifies the components. The blower motor relay often has a fan symbol next to it. 

Under the passenger dash

• Location: For some models, particularly those with dual/auxiliary heat, the relay may be located near the blower motor itself under the passenger side dashboard.
• Identification: Check the area around the blower motor resistor pack for a relay. 

This video demonstrates how to locate and replace the blower motor resistor in a Ford Expedition: 1mWarrior WoodshopYouTube · Aug 22, 2025
Troubleshooting steps

• If you suspect the relay is faulty, try swapping it with a similar, known-good relay (like the horn or A/C compressor relay) to see if the blower works. 
• Also, check the blower motor resistor pack, as it is a common point of failure and can cause the blower to work intermittently or not at all. 

Where is the blower motor relay located?

The blower motor relay is most commonly located in the main electrical fuse and relay box under the hood, near the battery, but it can also be in a separate box under the dashboard. To find the exact location, check your vehicle's owner's manual or look for a diagram on the inside of the fuse box cover, which will show the specific location and number of the relay. 
Location specifics 
This video shows the location of the blower motor fuse and relay box under the hood: 56sQuiteAlrightYouTube · Mar 15, 2022

• Under the hood: Look for a main fuse and relay box, which is often a black plastic box secured with clips. The cover usually has a diagram showing the fuse and relay layout. The blower motor relay is frequently located next to the blower motor fuse within this box. 
• Under the dashboard: In some vehicles, the relay might be behind a panel near the steering column or the glove compartment. 
• Home HVAC systems: If you are asking about a home furnace, the relay is typically found on the furnace's control board or in the electrical control panel. 

Where is the fuse for the blower motor on a 2000 Ford Expedition?

Regarding the blower motor, it is powered through Fuse 105 in the underhood fuse panel.

How to tell if a blower motor relay is bad?

A bad blower motor relay can be identified by symptoms like the blower fan not working at all, running intermittently, or being stuck on even when the system is off. Other signs include weak airflow, clicking or buzzing noises from the control panel, blown fuses, or a physically melted or burned relay. To confirm, you can test the relay with a multimeter for proper continuity and voltage or swap it with an identical, non-critical relay from elsewhere in the vehicle.
 
Symptoms of a bad blower motor relay

• No airflow: The most obvious sign is when the blower fan does not turn on at all, and you feel no air coming from the vents. 
• Intermittent operation: The fan may turn on and off unexpectedly or operate inconsistently. 
• Fan stuck on: In some cases, the relay can get stuck, causing the fan to run continuously even after the system is turned off. 
• Weak airflow: You may experience a noticeable decrease in the strength of the airflow from the vents. 
• Audible cues: Listen for clicking or buzzing sounds from the relay or control panel when the system is turned on or off. 
• Blown fuses: A faulty relay can cause electrical spikes or excessive current, which may blow the relay's fuse to protect the system. 
• Physical damage: Inspect the relay for any signs of burning or melting, which indicates it has been overheating from high current loads. 

How to test the relay 
This video demonstrates how to test a blower motor relay with a multimeter: 1mCarsNToysYouTube · Jan 31, 2020

• Swap the relay: The simplest method is to identify an identical relay for a non-critical system in your vehicle (e.g., the horn or fog lights) and swap it with the suspected bad one. If the blower motor now works, the original relay was the problem, notes this YouTube video. 
• Use a multimeter: 
  • Check for power at the relay's terminals when the blower is commanded on. If you have power, but the fan doesn't run, proceed to check the relay itself. 
  • Use the multimeter to check the relay's continuity. With the power off, you can check the resistance of the internal switch. An open circuit (no continuity) when it should be closed, or a zero-ohm reading indicating a short, means the relay is bad, says this YouTube video. 
  • You can also test for continuity on the switch itself. With the coil energized, check for voltage coming in and going out of the switch terminals. If power goes into the switch but doesn't come out, the switch is bad, according to this YouTube video. 
• Jumper the terminals: If you are comfortable working with electrical systems, you can temporarily bypass the relay by using a piece of wire to jump the terminals in the relay socket. If the blower motor turns on, the relay is bad. If it still doesn't work, the issue is likely with the motor itself or the wiring to it, as shown in this Quora post.