/How to Replace a Car’s Thermostat

How to Replace a Car’s Thermostat

A cooling-system thermostat that sticks in a closed or partially closed po­sition, preventing hot coolant from flowing through the radiator, will cause engine temperature to rise. If the thermostat sticks in the fully closed position, coolant will boil and the engine will overheat. If the ther­mostat sticks in a partially closed position, the engine may not overheat. However, excessive heat can cause the engine to detonate and/or diesel.

Thermostat at How to Replace a Car’s Thermostat

Here’s how to replace the thermostat:

  • With the engine cold, place a clean pan under the radiator drain valve (petcock), remove the radiator cap, and open the valve to allow coolant to drain.
  • Discard used coolant in an environmentally safe way by pouring it into glass or plastic containers with screw-on caps. Label the con­tainers “TOXIC LIQUID: AUTO COOLANT” and call your local en­vironmental or recycling officials for disposal instructions.
  • Close the petcock.
  • Unscrew the bolts holding the thermostat housing together.
  • Before removing the thermostat, make a sketch that notes distin­guishing marks on the thermostat and gasket and their positions relative to the housing. The sketch will help you install the new thermostat in the same way so as to prevent overheating.

Car Thermostat at How to Replace a Car’s Thermostat

  • Remove the thermostat and gasket from the housing. Discard the gasket, but keep the thermostat for the time being so you can take it to an auto parts store and buy a new one of the same type that is rated to open at the same temperature. Make sure a gasket comes with the new thermostat.
  • Use a wire brush to clean the thermostat housing and housing cover.
  • Following your sketch, install the new thermostat and gasket.
  • Position the thermostat housing and cover. Insert and tighten the bolts.
  • Install fresh coolant consisting of a 50:50 mixture of ethylene gly­col antifreeze and water unless the ambient temperature in your region requires a stronger solution.
  • Start the engine, let it run for a few minutes, turn it off, and check for a coolant leak around the thermostat housing. If coolant is leaking, further tighten the thermostat housing bolts.
VN:F [1.9.22_1171]
Rating: 0.0/10 (0 votes cast)

(Chief Designer / Editor / Journalist) – Zaheer is the chief designer of Motorward.com. He’s also responsible for part of the publishing team as well as a publisher and writer.