* Cooling Fan Relay(s): The Beretta likely has at least one, possibly two, cooling fan relays. These are usually located in a fuse box, either under the hood (the Power Distribution Center or PDC) or inside the passenger compartment (often under the dash). Check your owner's manual or a wiring diagram for the precise location. They're often easily identifiable as relays with larger-gauge wires connected.
* Engine Coolant Temperature (ECT) Sensor: This sensor is crucial. It monitors the engine coolant temperature and sends a signal to the PCM (Powertrain Control Module). It's usually located on the engine block or cylinder head, near the thermostat housing.
* Powertrain Control Module (PCM): The PCM receives the signal from the ECT sensor, along with other inputs (like A/C request), and determines when to activate the cooling fan relay(s). The PCM is usually located under the dashboard or under the hood (in a protected area). It's a large, usually black, electronic module.
* Wiring Harness: The wiring harness connects all the components: the ECT sensor to the PCM, the PCM to the relay(s), and the relay(s) to the cooling fan(s). Tracing these wires can be challenging without a wiring diagram.
To find the specific locations:
1. Consult a wiring diagram: This is the most accurate way. You can find wiring diagrams online (often on forums dedicated to Chevy Berettas), in a repair manual (like a Haynes or Chilton manual), or at a parts store.
2. Check the fuse box(es): Carefully inspect both the under-hood and under-dash fuse boxes. Look for relays with descriptions that suggest they are related to cooling fans, or that have thicker wires connected to them.
3. Follow the wiring: Once you locate a relay you suspect is for the cooling fan, carefully trace the wires connected to it. This can help you identify the other components involved in the circuit. Be cautious not to damage any wires.
Remember, working with automotive electrical systems requires some knowledge and caution. If you're not comfortable doing this yourself, it's best to take your Beretta to a qualified mechanic.
