Why does the Crown's water temperature rise and then drop back automatically?
1 Answers
The reasons why the Crown's water temperature rises and then drops back automatically: During traffic congestion or slow driving in urban areas, or after the air conditioning is turned on, the water temperature may exceed 90 degrees. When traffic conditions improve and the vehicle speed increases, or when the electric fan starts to enhance cooling, the water temperature may drop slightly, for example, below 90 degrees. Relevant information is as follows: If the water temperature frequently rises close to the red line (near boiling) and then drops, the cooling system should be checked for issues such as scale in the water channels or radiator, thermostat, or water temperature sensor. The causes and solutions for high water temperature in the Crown are as follows: 1. Insufficient or leaking coolant. Solution: Refill the coolant, identify the leak, fix it, and refill the coolant. 2. Dirty or clogged radiator (externally or internally). A dirty or clogged radiator affects heat dissipation or coolant circulation, leading to poor cooling. Solution: Clean the radiator if the exterior is dirty. If the interior is clogged, it is recommended to replace the radiator. 3. Damaged thermostat. If the thermostat is stuck in the closed position, the engine's coolant remains in a small circulation loop, preventing the radiator coolant from participating in the cooling cycle. This causes high water temperature during idling or low-speed driving, with the temperature rising further as the speed increases. Solution: It is recommended to replace the thermostat. 4. Damaged water pump. The water pump is the power source for coolant circulation. If it is damaged, the coolant cannot circulate for cooling, resulting in high water temperature. Solution: It is recommended to replace the water pump. 5. Damaged cylinder head gasket (blown gasket). This can occur due to prolonged engine operation with insufficient coolant or continued driving with high water temperature. Another cause is long-term use of water instead of coolant, leading to corrosion of the cylinder head and gasket failure. Solution: It is recommended to replace the cylinder head gasket.
