OEM 2000 Toyota 4Runner Thermostat

2000 Toyota 4Runner Thermostat Parts Questions & Experts Answers

• Q: How to Properly Service and Repair a Thermostat on 2000 Toyota 4Runner?

  A: The first task to service the thermostat includes draining engine coolant while removing the lower radiator hose. Remove the thermostat by unbolted the 3 nuts, wire clamp and water inlet before detaching the thermostat with its gasket from the water pump and then remove the gasket from the thermostat. The thermostat needs inspection by placing it in water while the water temperature rises to ensure its valve opens at 80 - 84 degrees Celsius (176 - 183 degrees Fahrenheit) with a lift of 8.5 mm (0.335 inch) at 95 degrees Celsius (203 degrees Fahrenheit). The thermostat needs replacement if it fails to reach the specified parameters. It is essential to check that the valve achieves complete closure at temperatures below 40 degrees Celsius (104 degrees Fahrenheit) because an inadequate closure requires a new thermostat. A new gasket must be placed on the thermostat and installation should proceed with the jiggle valve pointed downwards while using three bolts to fasten the water inlet at 20 Nm of torque (200 kgf-cm, 14 ft. lbs.). Next step is to reattach the lower radiator hose while filling the system with engine coolant followed by engine start up then look for any leaking points.