Genuine Mazda Protege Thermostat

Mazda Protege Thermostat Parts and Q&A

• Thermostat
  KL01-15-171A-9U
  Q: What steps should be taken before assuming the thermostat is responsible for a cooling system problem on Mazda Protege?

  A:

  Make sure the level of the coolant, the tension of the drive belt, and the work of temperature gauge or light on the thermostat are checked before blaming the thermostat as the culprit in a cooling system issue. In case the engine is slow to warm up, then the thermostat must be stuck open and changed. In case the engine is hot and the lower Radiator hose is not, then the thermostat might be clogged shut and therefore the thermostat will require replacement as it is not letting the coolant pass through the radiator. One should be careful since driving without a thermostat may produce poor emissions and fuel economy. When the lower radiator hose is hot, it means that the coolant is circulating and the thermostat is open. In order to remove the thermostat, unplug the negative power line on the battery, empty the radiator, and unplug the thermoswitch electrical connector on the thermal covering. Take off the radiator hose clamp and loosen the hose on the thermostat cover which may be left in place provided the cover is not being changed. Disassemble the thermostat cover of the engine and prepare to deal with the spill of coolant and then take out the thermostat, with a note of its way of installing it. Wipe down the sealing surfaces and then fix the new thermostat, spring end to the engine and bypass hole to the top. Install a new gasket, making sure that it fits correctly and the print side will be facing the cylinder head in later models. Install Revert the removal steps and tighten the screws connecting the thermostat cover to the required torque, refill the cooling system, start the engine, and inspect for leakage and functionality.