Also applicable to the Chevrolet Sonic, if Your Chevrolet Aveo's radiator fan fails to work, the first thing You should check is the radiator fan relay. These are known to fail early and fail often, and You'll also enjoy a significant coSTSavings over other repairs or replacements. However, it may not always be so simple and cheap, as there are a number of other things that can cause Your problems as well. You may have a bad thermostat, which will not allow the radiator fan to engage. Also possible are a defective coolant sensor or a temperature switch. The first thing to do in Your diagnosis is to check for any diagnostic trouble codes with an OBD-II, as Your problem is likely electrical. If none, then You can begin testing voltages and/or resistances on the relevant components.
Christopher L.
April 10, 2020
Some of the common causes of a chevy aveo fan problem are defective temperature switch, coolant sensor or other sensor. Engine thermostat is stuck open (engine never gets hot enough to turn on the fan) faulty fan relay. A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)
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