Ford Fusion Cooling Fan Relay Location by Model Year

Where the Fan Relay Sits on Each Generation

First-generation cars, built for the 2006 through 2012 model years including the 2010 refresh, use relays to switch the fan. They plug into the battery junction box, the large fused power distribution box beside the battery under the hood. Anyone looking for the 2012 Ford Fusion cooling fan relay will find it in this box. Some versions use more than one relay so the fan can run at a low and a high speed. The diagram printed inside the box lid, or the fuse chart in the owner's manual, identifies which positions belong to the fan on your specific car.

Second-generation cars, built for the 2013 through 2020 model years, control fan speed differently. An electronic fan control module mounted on the fan shroud varies motor speed based on a command from the powertrain control module (PCM). The fan circuit is still protected by a high-current fuse in the under-hood box, and depending on equipment a relay may supply power to the module. The actual speed switching, however, happens inside the module on the fan assembly. Owners who search these years for a conventional relay often replace a part that was never the cause.

How the Cooling Fan Circuit Works

The PCM decides when the fan should run, mainly from engine coolant temperature and air conditioning demand. On first-generation cars, the PCM energizes the low-current control coil of a relay. The relay contacts then close and send battery current through a fuse to the fan motor. A separate relay arrangement, or a resistor in some designs, provides the slower speed. This keeps the heavy fan current away from the computer, which only handles a small control signal.

On second-generation cars, the PCM sends a variable control signal to the fan module, which adjusts motor speed smoothly instead of switching between fixed steps. The module needs a solid power feed and a clean ground to work. Because the fan draws substantial current, corrosion or loose connections cause a voltage drop that can make the fan run weakly or not at all. Low system voltage from a weak battery or poor charging output has a similar effect, so overall electrical health matters as well as the fan components themselves.

What Changes the Answer

Engine and equipment can change the fan assembly and the layout of the power distribution box. First-generation cars came with four-cylinder and V6 engines, while the second generation offered several naturally aspirated and EcoBoost engines plus Hybrid and Energi plug-in versions. Relay positions and fuse assignments can also shift between model years within a generation. Treat the box lid label and the owner's manual fuse chart for your exact car as the final word. Do not rely on a photo of another Fusion, which may show a different box layout.

Hybrid and Energi models need extra care. Their cooling fan is still powered by the conventional 12-volt system, the same circuit fed by the starter battery. These cars also carry a high-voltage traction battery, connected through cables with orange insulation. Fan diagnosis never requires touching those orange cables, the high-voltage battery or its service disconnect, so leave them alone. A hybrid in Ready mode can start its gasoline engine on its own, so switch the vehicle fully off before working near the fan or belts. Hybrids also cool their power electronics, so treat a fan complaint on these cars with the whole hybrid cooling system in mind.

What You Can Check Yourself

Start by noting the symptom. Find out whether the fan never runs, runs only at one speed, runs constantly, or keeps running long after shutdown. Then inspect the fan fuse and confirm its fuse rating matches the label. Never fit a larger fuse. A fuse that blows repeatedly usually points to a dragging or seized motor or a shorted wire, and a new relay will not cure that.

On first-generation cars, the fan should normally run with the engine at operating temperature and the air conditioning switched on. If it does not, swap the fan relay with another relay in the same box that carries the identical part number, then test again. A meter can confirm whether battery voltage reaches the fan connector while the fan is commanded on. A scan tool with an output test function can command the fan directly, which saves waiting for the engine to warm up.

On second-generation cars, check the power and ground at the fan module connector while the circuit is loaded rather than with an unloaded meter alone. If both are good and the fan is commanded on but does not respond, the fan and module assembly becomes the main suspect. A fan that runs with the key off, or a module that never fully shuts down, can create a parasitic draw that drains the battery overnight. Throughout this work, keep hands, tools and clothing clear of the blades, because the fan can start without warning. Switch the ignition off and disconnect the negative battery terminal before unplugging fan or module connectors.

Limitations and When to Get Help

The locations above describe the general design of each generation, not the exact relay or fuse position on every trim and build date. For pin-level testing, use a factory-level wiring diagram matched to your vehicle. If you need to bridge a circuit for testing, use a fused jumper only, never a bare wire across a relay socket, because a wrong connection can damage the PCM or wiring.

If the temperature gauge climbs while the fan is not running, stop driving, since continued overheating can damage the engine far beyond the cost of a fan repair. Hand the job to a professional when fan module fault codes persist, the fuse keeps failing, connectors show heat damage, or the car is a Hybrid or Energi and the problem goes beyond the basic 12-volt checks described here.