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. The most common reasons a Volvo S80 radiator fan isn't working are the fan assembly, the fan clutch, or the coolant temperature sensor. 0 % 45 % of the time it's the Fan Assembly 0 % 45 % of the time it's the Fan Clutch 0 % 10 % of the time it's the Coolant Temperature Sensor Common Repairs Serpentine Belt Replacement Symptoms of a Cooling Fan Module Failure. A problem in the cooling fan module will not go undetected in your Volvo because of the important role that it plays. Some of the symptoms that you will notice immediately when this problem occurs include: An overheating engine. When the cooling fan module fails completely, the cooling fans will not If the fan does work when the engine is hot but does not when A/C is switched on, then could be either low refrigerant charge, bad pressure sensor, or bad compressor/clutch. I'm not sure what you are referring to as the 5 A ECU fuse, but it can't be the fan power source as this is far too low to support the fan. If the fan runs, you probably have problems with the relay or the temperature sensor. The temp sensor is just below the thermostat in the lower thermostat housing near the power steering pump. The attached diagram show you the wiring for our Volvo> Hope this helps, good luck. 2004 Volvo s60 2.4L I5 Cooling Fan Replacement Explanation. I was pretty sure I had correctly diagnosed that my Engine Cooling Fan / FCU (Fan Control Unit) were bad, but I wanted to make sure .

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