Toyota Corolla

1992-1998 of release

Repair and operation of the car

Toyota Corolla
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
- 4. Cooling systems, heating
   4.1. Specifications
   4.2. Antifreeze
   4.3. Thermostat
   4.4. Fan and relay of turning on of the fan
   4.5. Radiator and broad tank
   4.6. Pump of cooling liquid
   4.7. Sensor of temperature of cooling liquid
   4.8. Fan block
   4.9. Heater radiator
   + 4.10. Control panel heater and conditioner
   4.11. Vlagootodelitel of the conditioner
   4.12. Compressor
   4.13. Condenser
   4.14. Evaporator and broad valve
+ 5. Fuel, exhaust systems
+ 6. System of decrease in toxicity
+ 7. Transmissions
+ 8. Coupling and half shafts
+ 9. Brake system
+ 10. Suspension bracket and steering
+ 11. Body
+ 12. Electric equipment

4.3. Thermostat



Before full cooling of the engine it is forbidden to turn off a radiator stopper, to remove the thermostat and to merge liquid from the cooling system.


1. Before drawing a conclusion that is the main reason for abnormal operation of the cooling system malfunction of the thermostat, check liquid level (see subsection 2.3) and the sensor of temperature of cooling liquid (or the light indicator).
2. If the engine is long warmed (it can be determined by slow increase of temperature according to the index, or on slow heating of air by a heater), sticking of the valve of the thermostat is a probable cause. In this case replace the thermostat.
3. At an overheat of the engine check heating of the top hose of a radiator. If the hose warm, and the engine hot, the thermostat is closed, blocking access of liquid from the engine to a radiator. Replace the thermostat.


The driving without thermostat is forbidden. In the absence of the thermostat the chain of feedback of automatic control of systems of decrease in toxicity of otrabrotanny gases and fuel system is disconnected, their refusal is as a result possible.

4. If the radiator hose hot, the thermostat is open and liquid circulates through a radiator. Carry out further check being guided by the section "Search of Malfunctions" at the end of the management.


1. Disconnect the battery from weight.
2. Merge liquid from a radiator.
3. Disconnect the fan thermoswitch socket (it is specified by an arrow) on a thermostat cover which is directly under the distributor, on the left side on a head of cylinders, and turn off two nuts of fastening of a cover of the thermostat to the case.
4. Uncover the thermostat the case. Keep in mind that at removal of a cover cooling liquid will spill. If the cover of the thermostat does not change, do not remove a radiator hose from a cover.
5. Remove the thermostat, having paid attention to its situation in a cover or in the case, carefully clear the condensed surfaces. The spring of the thermostat has to be turned towards a head of cylinders.
6. The thermostat is condensed on the periphery with profiled laying. Establish new laying on the thermostat. Be convinced of a uniform prileganiye of laying on all contour.
7. On engines 4A-FE and 7A-FE install the thermostat and a cover so that the pin was turned up. On engines 4E-FE orient the thermostat so that the pin was combined with a ledge on a cover then establish a cover and the thermostat.
8. Tighten fastening nuts with the moment specified in subsection 4.1. Establish other details upside-down.
9. Fill the cooling system with liquid (see subsection 2.8.4), start the engine and check existence of leaks and operation of the engine.