1. Check the obvious:
* Coolant Level: Low coolant can trigger a safety mechanism to prevent fan operation. Check the coolant level in the overflow tank (expansion tank). If low, add coolant appropriate for your vehicle. Never open a hot radiator or overflow tank!
* Engine Temperature: Is the engine overheating? If the engine is already at operating temperature and the fans aren't running, it's a problem. If it's not overheating, the problem might be in the fan control system itself.
* Fuse(s): Check the fuse(s) related to the radiator fans in the fuse box under the hood and possibly inside the cabin (consult your owner's manual). Replace any blown fuses.
* Relay(s): The fan system usually utilizes a relay. These relays can fail. You'll need to locate the relay (often in the under-hood fuse box) and test it with a multimeter or swap it with a known good relay of the same amperage and rating. (If you're unsure about this step, consult a repair manual).
2. More advanced troubleshooting (requires some electrical knowledge and tools):
* Fan Motor(s): If the fuses and relays are good, the fan motors themselves could be faulty. You can try testing them directly with power (with caution, and making sure the power is disconnected when not testing), but this requires some electrical knowledge.
* Temperature Sensor(s): The system uses a coolant temperature sensor to tell the control module when to turn the fans on. A faulty sensor might not be sending the correct signal. This needs testing with a multimeter.
* Cooling Fan Control Module (or PCM/ECM): The control module (sometimes integrated into the Powertrain Control Module (PCM) or Engine Control Module (ECM)) sends the signal to activate the relay. A malfunctioning module is less likely but possible. Testing this requires advanced diagnostic tools.
* Wiring: Check the wiring harness for damage, shorts, or loose connections between the temperature sensor, the relay, and the fan motors themselves.
Important Notes:
* Safety First: Working on the cooling system involves hot components. Allow the engine to cool completely before working on it.
* Repair Manual: A repair manual specific to your 1997 Dodge Stratus is invaluable. It will show you wiring diagrams, fuse locations, and other crucial information.
* Professional Help: If you're not comfortable with electrical diagnostics, it's best to take your vehicle to a qualified mechanic. Ignoring a malfunctioning cooling system can lead to engine damage.
By systematically checking these points, you should be able to pinpoint the cause of the problem. Remember to always consult your owner's manual for specific information relating to your vehicle.
