Attention! Wait until the engine has completely cooled down before starting this operation.
1. The coolant temperature indicator system consists of a temperature indicator lamp installed on the instrument panel and a fluid temperature sensor on the engine. On both the 3.8L engine and the 3.1L engine, the coolant temperature sensor is mounted on the left side of the cylinder head (see illustration). Some vehicles have more than one coolant temperature sensor, but the one used for the temperature gauge has only one wire.
9.1. coolant temperature sensor (indicated by an arrow) located on the left side of the rear cylinder head
2. If the lamp or indicator indicates engine overheating, check the coolant level in the cooling system and make sure that the wiring between the lamp or indicator and the temperature sensor is secure and that all fuses have contact.
3. When the ignition key is turned and the starter is operating, the overheating lamp should light up (if it is provided by the design). When the engine starts, the lamp should go out.
4. If the lamp does not light, it may be burned out, the ignition switch is faulty, or there is an open circuit. Test the circuit by touching "masses" coolant temperature sensor wire (To ensure safety, the engine must not be running). If the pointer needle deviates full scale or the lamp lights up, replace the coolant temperature sensor.
5. As soon as the engine starts, the lamp should go out and remain in this state until the engine overheats. If the lamp does not turn off, this may be due to a short between the lamp and the coolant temperature gauge, a malfunction of the temperature sensor, or a malfunction of the ignition switch. Check if the correct type of coolant is filled (see section 2). Plain water may have a boiling point too low for the coolant overheating sensor to trip and the warning light to come on.
6. If it is necessary to replace the coolant temperature sensor, unscrew it from the engine and install another one. For threads, use Teflon tape or a thin layer of sealant. Before removing a faulty sensor, make sure the engine is cold. There may be some loss of coolant when the sensor is removed, so be prepared to top up the level. After replacing the coolant temperature sensor, check the coolant level in the reservoir (see chapter 1, section 4).