2. If you notice that the engine takes a long time to warm up to operating temperature (according to the indicator), the thermostat may be stuck open. In this case, the thermostat must be replaced.
3. On the other hand, a long warm-up may be due to the lack of a thermostat. It could have been done on purpose or unintentionally (forgot to install after repair). Do not drive the car without a thermostat. The engine management system will keep the engine in warm-up mode for a longer time. During this time, the engine will consume more fuel, and the exhaust gases will contain more harmful impurities.
4. If the engine overheats, feel the upper radiator hose. If it's not hot and the engine is overheated, the thermostat may be stuck in the closed position. The liquid does not enter the radiator and circulates in a small circle. In this case, replace the thermostat.
5. If the upper radiator hose is hot, the thermostat is open and fluid is circulating normally through the system. In this case, see the recommendations in the section Troubleshooting Introductions.
Removing
1. Disconnect the ground cable from the battery (refer to section CAN digital data bus).
2. Empty the cooling system (contact the head Current service). If you are not going to add new fluid to the system, save the drained fluid for later use.
3. Remove the thermostat. Note the location of the bleed valve and the orientation of the thermostat itself.
Examination
1. If the thermostat is open at room temperature, it is defective and must be replaced.
2. For a rough test of the thermostat's performance, hang it on a piece of twine in a container of water. The thermostat must not touch the walls of the container. Start heating the container.
3. As the water heats up, the thermostat should open (this happens just before the water boils). Because the boiling point of water is 100°C, the thermostat may not open fully (talk to Specifications). Remove the thermostat and let it cool down. As it cools, it should close completely.
4. If the thermostat does not open when heated or does not close when cooled, replace it.
5. Keep the following in mind when installing the thermostat:
- a) Thoroughly clean the mating surfaces and replace the O-ring.
- b) Place the thermostat into the housing, orienting correctly.
- c) Tighten the cover bolts to the required torque.
- d) Install all hoses in their original places, then fill in the coolant (contact the head Current service).
- e) Start the engine, warm up to operating temperature and check for leaks.