Cooling Fans — Checking and Replacing [Toyota Camry XV20]

Contents: Examination ↓ Checking the relay ↓ Replacement ↓

Location of coolant temperature sensor N1 (4-cylinder models)

Coolant Temperature Sensor N1 (indicated by the arrow) located at the rear of the radiator.

Location of coolant temperature sensor N1 (6-cylinder models)

In 6-cylinder models, the coolant temperature sensor (indicated by the arrow) located on the thermostat housing.

Main Engine Relay and Cooling Fan Relay N1 - Avalon Model

A – main engine relay
B – cooling fan relay

Cooling Fan Relay Box - Avalon Model

(The material is reprinted from an online resource www.ToyotaMAN.ru)

Examination

1. If the cooling fan does not turn off when the engine is cold, disconnect the wire from the fan temperature sensor and short the wire contacts with a jumper. If the fan stops, replace the sensor.

2. Check the N1 fan sensor with an ohmmeter. When the engine is cold, the sensor circuit should be closed. When the engine is warm, the sensor circuit should be open.

3. Check the N₂ sensor in the same way. The circuit is open if the temperature is below 84°C and the circuit is closed if the temperature is above 90°C. Replace the sensor if necessary.

4. If the blower motor is faulty, first check the blower fuse located under the hood in the relay and fuse box. Disconnect the wire from the blower motor and connect the fan terminals with adapters to the battery terminals. If the fan still does not work, replace the motor.

5. If the sensors are working properly and the motor passes the test, then it is necessary to check the fan relay, wiring and electronic control unit.

Checking the relay

1. The relay box is located on the left side of the engine compartment. If the vehicle is equipped with an air conditioning system, the relay box contains the N₂ relay for the second fan, and some models contain the N3 relay (see Fig. Cooling Fan Relay Box - Avalon Model).

2. Remove relay N1 and check it with an ohmmeter. The circuit should be closed between contacts 1 and 2 (85 and 86 on Bosch relays) and between contacts 3 and 4 (30 and 87a 86 on Bosch relay). When battery voltage is applied to contacts 1 and 2, the circuit should be open between contacts 3 and 4.

3. If the relays are functioning properly, remove the main engine relay and test it. The circuit is closed between terminals 3 and 5 and terminals 2 and 4. The circuit is open between terminals 1 and 2. When voltage is applied to terminals 3 and 5, the circuit 1-2 is closed and the circuit 2-4 is open. If all relays are functioning properly and the fan still does not function, contact a specialist.