Chevy Cruze Cooling Fan Relay Location and How to Check It
On most Chevy Cruze models, the cooling fan relays are in the underhood fuse block, the black plastic box in the engine compartment, typically on the driver's side near the battery. Model year and engine determine how many fan relays are fitted, which sockets they use, and whether the fan relies on a separate control module instead. This guide covers how to find the right relay, how the circuit works, and how to check it safely.
Where the Cruze cooling fan relay is located
Open the hood and find the underhood fuse block next to the battery. Release the latches on the lid and turn the lid over. The underside carries a printed map of every fuse and relay position, with labels identifying the fan relays. Depending on the vehicle, you may see one cooling fan relay or several, such as separate relays for low speed, high speed and speed control. The owner's manual has the same layout in its fuse and relay section and is the next reference if the lid label is worn or missing.
Plug-in relays look alike, so identify the cooling fan relay by its labeled position rather than by appearance. Some relays on later vehicles are soldered into the fuse block or mounted where they cannot be pulled by hand. If the lid diagram shows a fan relay position but no removable relay sits there, that design difference is expected. It does not by itself mean a part is missing.
How the cooling fan circuit works
The cooling fan motor draws far more current than the engine control module can switch directly. A relay solves this problem. The relay has a low-current coil circuit and a high-current contact circuit. The engine control module energizes the coil, usually by completing its ground path, when coolant temperature, A/C refrigerant pressure or another input calls for airflow. The coil then pulls the contacts closed, and battery power flows through a high-amperage fuse and the contacts to the fan motor.
Where a two-speed fan is used, a combination of relays can route current through a resistor or switch the motor windings to produce low and high speeds. That is why a single failed relay can cause one speed to stop working while the other still operates. System voltage matters here too. A weak battery, corroded battery terminals or poor charging output can leave the coil underpowered or slow the fan, which can look like a relay fault.
What changes the answer
The biggest variable is generation. First-generation Cruze models, sold roughly from 2011 through the 2016 Limited, generally use plug-in fan relays in the underhood fuse block. Second-generation models from 2016 onward may use a different fuse block layout. On some versions, fan speed is managed through a control module on or near the fan assembly instead of a set of conventional speed relays. Engine choice also matters. The gasoline engines and the diesel can differ in fan configuration and relay count, so a relay chart for one Cruze may not match another.
The Cruze uses a conventional 12-volt starter battery and has no high-voltage traction system, so the fan circuit works like that of any ordinary gasoline or diesel car. This guidance does not apply to related GM plug-in or hybrid vehicles that share some components. On those vehicles, high-voltage cables and modules require manufacturer isolation procedures and should be left to trained technicians.
What the owner can do
Work with the engine off and cool, the ignition off and the key away from the vehicle. Keep hands, clothing and tools out of the fan area. On many cars, the electric fan can start without warning, even with the ignition off, if the engine is still hot. Before unplugging the fan motor connector or working near the fan blades, disconnect the negative cable from the battery terminals. Removing a relay from the fuse block is generally safe with the ignition off, but never probe sockets with ordinary metal tools.
A quick first check is a swap test. Move an identical relay with the same part number from a non-critical position into the fan relay socket and see whether the fan behaves differently. Next, inspect the related fan fuse for a break and confirm its fuse rating matches the lid label. Never install a higher-rated fuse, because a fuse that blows repeatedly points to a short circuit or a seized fan motor drawing excessive current. With the engine warm, or with the A/C switched on if your Cruze commands the fan with A/C, listen for the relay clicking and watch whether the fan starts.
With a digital multimeter and the wiring diagram for your exact vehicle, you can confirm battery voltage at the relay feed terminal and check whether the control side receives a command. A scan tool with bidirectional controls can command the fan on directly, which separates control problems from power-side problems. A voltage drop test across the fan feed and ground under load can reveal a corroded connection that a simple continuity check would miss. If the fan runs after the car is parked and the battery keeps going flat, a stuck relay may be causing parasitic draw. Pulling the relay overnight and rechecking the battery is a reasonable test.
Limitations and next step
Relay counts, socket positions and fan control strategies vary across Cruze years, engines and trims, so no single layout applies to every car. Treat the fuse block lid label, the owner's manual and the factory wiring diagram for your vehicle's VIN as the authoritative references. If the fan uses a control module, if the fuse block has integrated relays, or if tests show a correct relay with no fan command, a technician with dealer-level diagnostic software can check sensor inputs, module logic and stored trouble codes. An engine that is overheating should not be driven while the fault is traced, because a fan that fails to run can quickly lead to costly engine damage.