Posts Tagged: temperature gauge drops when driving

Troubleshooting: Temperature Gauge Drops While Driving

Why the Temperature Gauge Drops While Driving? If your temperature gauge rises when idling but drops when driving, the cause is almost always a stuck open thermostat. The reason the temperature gauge drops when driving is that there’s much greater airflow through the radiator when you’re at speed than at idle. That increased airflow drops the temperature of the coolant coming into the engine. The job of the thermostat The thermostat is closed when you first start your engine. As the engine coolant heats up to around 150°F, the thermostat … Read More