Buick Encore Cooling Fan Relay: Identification and Location

Where the Encore Fan Relay Is Located

On most Buick Encore models, the cooling fan relay or relays sit in the underhood fuse block. This is the black plastic box in the engine compartment near the 12-volt battery. Unclip the lid and look at the diagram printed on its underside. Fan relays are usually marked with a fan symbol or an abbreviation such as FAN, and they are sometimes numbered when there is more than one. The fuse section of the owner's manual shows the same layout with descriptions. Match the label to the position on your own vehicle rather than relying on a photo of another one, because positions differ between versions.

Two qualifications matter. First, many Encore cooling systems use more than one relay to provide low and high fan speeds, so "the" relay may actually be a set. Second, some GM fuse blocks have relays soldered onto the internal circuit board instead of plugged into sockets, and those cannot be replaced individually. If the lid diagram shows a fan relay position but there is no removable relay in that spot, your vehicle probably has this design.

How the Fan Relay Circuit Works

A relay is an electrically controlled switch with two sides. The control side is a small coil supplied with system voltage. The engine control module switches this coil, usually by completing its ground path when it wants the fan on. When the coil is energized, it pulls a set of contacts closed on the load side. Those contacts connect a fused battery feed to the fan motor. This arrangement lets a low-current computer output control a motor that draws far more current than the module could handle directly.

The engine control module decides when to run the fan based on inputs such as coolant temperature, air conditioning refrigerant pressure and vehicle speed. Turning on the A/C usually triggers a fan request even when the engine is cool, which makes it a convenient test. On two-speed systems, the module energizes different relay combinations to run the fan at low or full speed. Common methods include routing current through a resistor or switching motor windings between series and parallel connections. Only the wiring diagram for your specific Encore shows which arrangement it uses.

What Changes the Answer

The first-generation Encore, sold in the US for the 2013 through 2022 model years, and the later Encore GX are different vehicles. They have different engines, engine bays and fuse block layouts, so instructions written for one do not automatically apply to the other. Even within one generation, the number of fan relays, their positions and whether they can be replaced individually may vary with model year, engine and optional equipment. The label on your own fuse block lid is the reliable reference.

US-market Encore and Encore GX models use gasoline engines with a conventional 12-volt electrical system. The fan relay circuit is powered by the starter battery, and there is no high-voltage traction battery to isolate. Hybrid and electric vehicles use orange high-voltage cabling and dedicated shutdown procedures, but those do not apply here. Still treat the 12-volt fan circuit with care, because a shorted feed can carry enough current to melt wiring or blow fuses.

What the Owner Can Check

Start with simple observations. Warm the engine, turn on the A/C and see whether the fan runs, then compare that with the engine cold and the A/C off. If the fan never runs, the cause could be the relay, its fuse, the motor, the wiring or the control signal. If the fan runs continuously, even after the key is off, the relay contacts may be stuck closed. That condition can also create a parasitic draw that drains the battery overnight. Next, check the fan fuse and confirm its rating matches the lid diagram. A blown fan fuse often means the motor is drawing too much current, so replacing the relay alone will not fix the problem.

Before blaming the relay, inspect the battery terminals for corrosion and confirm the charging output is normal. Low or unstable voltage can make relays chatter and fans run weakly, which can look like a relay fault.

If the relay plugs in, you can swap it with an identical relay from a less critical position. Match the part number and pin layout, then see whether the symptom moves with the relay. A multimeter allows more precise checks. With the ignition on, confirm system voltage at the battery-feed terminal of the relay socket. Then, while the fan is commanded on, measure the voltage drop across the closed relay contacts and along the fan circuit. A healthy relay shows very little drop, so a reading of several tenths of a volt points to worn contacts or a poor connection. The fan can start without warning while the engine is hot or the A/C is on, so keep hands, tools and loose clothing away from the blades during any test.

Limitations and Next Step

This guide cannot replace the wiring diagram and fuse block layout for your exact vehicle. Relay positions, labels and circuit numbers depend on model year and equipment. If the relay is soldered into the fuse block, the repair may involve replacing the fuse block assembly rather than a single part. If the relay and fuse test good but the fan still does not respond, the fault may be in the motor, the connector, the wiring or the output from the engine control module.

A scan tool that can command the fan through output controls and read stored trouble codes will narrow down these causes quickly, and many independent shops and dealers can perform this test. Get help promptly if the temperature gauge climbs or an overheating warning appears, because driving an overheating engine can cause expensive damage. Until the fan is confirmed working, avoid long idling in hot weather.