What Causes High Engine Coolant Temperature in Traffic Jams?
3 Answers
High engine coolant temperature during traffic jams occurs because the radiator and cooling fan cannot operate at full capacity when the vehicle is idling, preventing heat from being dissipated effectively through the radiator and cooling fan. When the engine runs at full load, it also drives the cooling system to work at full capacity, so the temperature drops while driving, which is a normal phenomenon. Below is relevant information about engine coolant temperature: 1. Normal conditions: Generally, the normal operating temperature for most passenger cars is between 80°C and 105°C (when antifreeze is added), but the typical coolant temperature usually stabilizes around 90°C. Most standard vehicles cannot sustain temperatures above 100°C for extended periods, with 105°C being the critical limit. 2. Solutions for high temperature: Try switching to a higher-concentration coolant, check for smooth coolant flow in the pipes, and inspect the thermostat and dashboard sensor.
High engine temperature during traffic jams is mainly because the car isn't moving and there's no airflow to assist cooling, forcing the cooling fan to work harder. If the fan malfunctions—such as from a burnt relay or blown fuse—it won't operate. Dust buildup on the radiator surface can also block airflow. Aged or insufficient coolant reduces heat transfer efficiency, causing temperatures to spike. A faulty water pump can disrupt the circulation system, hindering coolant flow and making overheating more likely. Additionally, a stuck thermostat that fails to open traps heat. Preventive measures include regular coolant replacement and cleaning the radiator fins. If the engine overheats in traffic, shifting to neutral and lightly revving the engine can help spin the fan faster. Experience shows that addressing these issues early can prevent bigger problems.
Once I was stuck in traffic when the temperature gauge suddenly shot up, and steam started coming from under the hood. After checking, I found the fan wasn't spinning. The mechanic later told me it was due to poor relay contact. In slow-moving traffic, with no natural airflow for cooling, the fan becomes crucial. I hadn't changed the coolant for over a year, and its reduced effectiveness combined with the soaring temperature. The lesson was profound: regularly check the coolant level and purity; if this happens in traffic, immediately turn the heater to maximum to help cool the engine. Remember to pull over and take a break—don't push through. Handling it this way protects the engine and extends its lifespan.
