Which is hotter, the upper or lower radiator hose?
1 Answers
The upper hose is hotter. Below are the causes and solutions for abnormal radiator water temperature: 1. Slow temperature rise: Both hoses have the same temperature, and there's almost no heating in the car. The cause is a thermostat that doesn't close properly or has been illegally removed during maintenance. Solution: Replace and install a new thermostat. 2. After the engine heats up: The fan operates when the water temperature exceeds 95°C, but the lower hose is slightly cooler than the upper hose. This is caused by insufficient thermostat opening, weakening the cooling system's function. This situation is common but often overlooked. Solution: Replace the thermostat. 3. When the temperature gauge reaches 95°C with the fan on: Both hoses are equally hot. This is due to issues in the fan circuit, which could be: a damaged fan, a faulty thermal switch on the radiator, or a blown fuse (often accompanied by early-stage circuit or fan issues). Solution: Replace the fan; replace the thermal switch; replace the fuse and inspect the circuit.