Genuine Volvo 245 Thermostat

Volvo 245 Thermostat Parts and Q&A

• Thermostat
  273307
  Q: How to replace a faulty thermostat and testing its functionality on Volvo 245?

  A:

  The action of the thermostat is characterized by the distinct change-over upon the flow of coolant through the main hose connected from the top of the thermostat casing to the Radiator, by which the circulation path to the Water Pump is closed off by the action of the tongue at the bottom of the thermostat, it is important that the tongue should not be bent or twisted on the installation or removal of the thermostat. To replace a faulty thermostat, reduce the coolant level in the engine by partial draining of the coolant through the tap fitted on the cylinder block into a clean container for reuse. Then remove the nuts holding the thermostat housing and lifting eye and lift off the thermostat housing and remove the thermostat. Clean the contact faces of the head and housing and install a new thermostat in the same position along with a new gasket, and reattach the housing and lifting eye before refilling the system through the expansion tank. To check a suspect thermostat, it is suspended in a heated water and the temperature at which it starts to open and the temperature at which it reaches the fully open position are compared with specified values. Typically, when a thermostat fails it stays closed which causes the engine to overheat, and if it cannot be replaced right away, removing the thermostat can be a temporary fix for an overheating engine, but that will not only result in longer engine warming up periods, but will also prevent the coolant from regulating the engine temperature to optimal levels and will be vital to replace the thermostat as soon as possible.