Location and replacement of the thermostat on the Toyota Corolla is relatively simple and should only take a few minutes to replace. The thermostat is a vital piece of equipment for the Corolla coolant system. The thermostat maintains the engine temperature and ensures that the coolant is dispersed through the engine to keep the vehicle cool and from overheating especially during times of heavy use.
Locating the Thermostat
Open the bonnet to access the engine compartment. Locate the radiator in the front of the engine compartment. There are two hoses that run off the radiator. The bottom hose runs to the water pump and is where the coolant is pushed into the radiator and moves up through the ridges to allow time to cool off. The top hose is the hose that runs to the thermostat housing. Follow the top radiator hose to where it is clamped to the motor and you will notice a housing that the hose is clamped to. The housing can be opened with a socket wrench. This housing contains the thermostat. You may need to remove the radiator hose to access it. Unscrew the hose clamp and pull the hose off the assembly. Once the housing is opened you can pull the thermostat out with your fingers.
Replacing the Thermostat
Cleaning the assembly is a must as there is old gasket material that has melted to the housing surfaces. You can clean this with a putty knife or a razor scraper. Once the surface is clean you will be able to replace the thermostat and put the assembly back together. You will want to apply a new gasket to ensure that there is no coolant leak from the thermostat housing. Place the new gasket on the surface top and make sure the holes in the gasket match up to there the bolts match up on the assembly. Once the gasket is matched up on the assembly you can cover the housing with the top half of the housing assembly. Tighten the bolts back to the housing with the socket wrench. Place the hose back on to the hose inlet pipe and tighten the hose clamp. Take the cap off the radiator to ensure that the coolant level is full as you may have lost some in the process of changing out the thermostat. Place the pressure cap back on the radiator and close the bonnet.