Genuine Mazda MPV Thermostat

Mazda MPV Thermostat Parts and Q&A

• Thermostat
  8AH1-15-171B-9U
  Q: What steps should be taken before assuming the thermostat is the cause of a cooling system problem on Mazda MPV?

  A:

  Before one can blame the thermostat as the cause of the cooling system issue, verify that the coolant level, drivebelt tension, and use of temperature gauge or light have been checked. In case the engine takes long time to warm up depending on the heater output or temperature gauge operation then probably the thermostat is stuck open and needs replacement. When the engine is overheated, inspect the upper radiator hose temperature; when the engine is not, then the thermostat is likely stuck shut, and coolant cannot get out of the engine to the radiator, and needs replacement. They should be cautious because unchecked driving with the absence of a thermostat may cause emission and fuel economy problems. When the thermostat is open then the upper radiator hose is hot and the coolant is flowing. Unscrew the negative battery cable and empty out the cooling system, reserving the coolant in good shape. In a four-cylinder engine with a V6 engine, follow the lower radiator hose to locate the thermostat cover and in a four-cylinder engine, follow the upper radiator hose to locate the thermostat cover. Unscrew the hose clamp and remove the hose; when it is hard to do, twist and break the seal with adjustable pliers. The thermostat cover can be replaced in case the outer surface of the fitting is in a very poor condition. Unscrew the bolts or nuts to take off the thermostat cover keeping the direction in which the thermostat was installed. Wipe the thermostat housing on both sides clean off all gasket material and (where necessary) replace the rubber gasket on a V6 engine. Install the new thermostat in the housing making sure the jiggle pin is in the 12 o'clock position when using a four-cylinder engine and the spring end is pointing into the engine. Install the cover and bolts or nuts again making sure that the mark on the thermostat cover is facing the front of the car and the bolts are tightened to the required torque. The other procedures include undoing the removal process, filling the cooling system, booting the engine to normal operating temperature, and leakages and correct thermostat functioning.