Genuine Volvo 245 Cooling Fan Assembly

Volvo 245 Cooling Fan Assembly Parts and Q&A

• Fan Blade
  1257866
  Q: How to test the Cooling Fan Assembly thermal switch and relay on Volvo 245?

  A:

  This is fitted to 1984 and later fitted with a turbo inter cooler or air conditioner. A thermal switch is included in the lower radiator hose and a relay is included in the wiring circuit. To test the circuit and relay, bridge over the terminals of the thermal switch and switch on the ignition, the fan should work. The working of the thermal switch can be tested by heating it, and then cooling it down, and checking to see if it activates and deactivates at the given levels if connected as part of a test lamp circuit.
• Fan Blade
  1274042
  Q: What are the features and functions of the Cooling Fan Assembly on Volvo 245?

  A:

  The 820 and 821 engines have a fixed plastic cooling fan with a slipping viscous drive coupling. At low speeds, the fan blades turn in synchrony with the water pump shaft, but as the water pump begins to speed up, the fan speed stabilizes and begins to decrease at water pump shaft speeds above 4000 rpm. The fan coupling is made up of a central hub with a flange bolted to the front of the water pump pulley and the fan itself is bolted to the back of the coupling unit with four bolts. The disc on the central hub is coated with friction material that drags against the viscous liquid inside the coupling which generates heat due to energy dissipation that is managed by cooling fins. Issues with this unit are rare unless the wear or mechanical damage is causing an oil leakage which would be noticeable. To ensure proper function, the fan blades can be rotated by hand and feel slight resistance in the coupling and for precise measurement, one can put chalk marks on the fan pulley and fan and compare their speed using a stroboscope. If the coupling of the fan fails, repair is unlikely and replacement is required.