Reasons a Volvo XC90 Radiator Fan Isn't Working. The most common reasons a Volvo XC90 radiator fan isn't working are the fan assembly, the fan clutch, or the coolant temperature sensor.
Your volvo fan relay is a two stage (speed) relay. It constantly has a 12v feed. As soon the ECU provides low or high speed ground signal to it, it will energize the fan accordingly. Have you started noticing that your air conditioner isn't running quite as cool as it once did? There's a chance that this is related to a defective volvo fan relay.
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volvo cooling fan not working
