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Coolant Present but Still Showing Overheating Temperature?

2 Answers

MarleyLynn

09/04/25 5:33am

Having coolant but still displaying an overheating temperature could be due to a clogged radiator, a stuck thermostat, or malfunctioning water pump/fan rotation affecting the engine temperature. Below are relevant explanations: 1. Hazards of overheating: Normal engine operating temperature ranges between 85-95°C. When overheating occurs, engine oil viscosity thins, reducing lubrication efficiency. High-speed components like pistons and valves may deform, causing power loss. Severe cases can lead to cylinder scuffing or crankshaft seizure, necessitating engine overhaul. 2. Handling overheating: For prolonged driving-induced overheating, safely pull over, activate hazard lights, and allow natural cooling. Damaged cooling fans require immediate repair at the nearest service center. When replacing a faulty thermostat, block the minor coolant circuit to ensure full radiator cooling capacity.

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MacLeo

09/16/25 6:34am

I've encountered this situation multiple times during long-distance drives. The coolant level is full, but the temperature warning light keeps coming on, which is really frustrating. It's usually a fault in the cooling system. For example, the thermostat might be stuck closed and won't open, preventing the coolant from circulating. Or the water pump could be aging, causing poor water flow. As for the fan, if it's broken or the belt is loose, heat can't dissipate properly, leading to overheating. Sometimes, it's a leaking head gasket or air bubbles in the system causing an airlock. At the time, I did some basic troubleshooting: first, I checked if the fan was running and if the temperature dropped, then felt the temperature difference between the inlet and outlet hoses—a big difference indicates a water pump issue. Don't ignore an overheating engine; pull over, turn off the engine, and check it out. Otherwise, severe engine damage can be costly to repair. Regularly replacing the coolant and maintaining the radiator can reduce risks, but for complex issues, it's best to leave them to a professional mechanic.

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