Coolant Present but Still Showing Overheating Temperature?

[MarleyLynn]

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.

[MacLeo]

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.

[OXavier]

I've been pondering this issue for quite some time. As a car enthusiast, I believe the key lies in cooling efficiency. Even with coolant present, high water temperature is mostly caused by circulation issues: it could be a faulty thermostat stuck closed, a corroded water pump that's stopped working, a burnt-out fan motor, or debris clogging the radiator fins. Air bubbles accumulating and blocking flow can also be the culprit. Troubleshooting can be quite interesting: first try manually starting the fan and listen for unusual noises, then check hoses for leaks or deformation. I once fixed this issue through DIY repairs and found that simply cleaning the radiator fins worked wonders. Additionally, the ECU sometimes misreads sensor data, and faulty sensors can trigger false alarms. High water temperature affects engine lifespan, so immediate action is required upon discovery to avoid roadside breakdowns. During maintenance, pay attention to checking component lifespans - prevention is always better than cure.

[MacEmily]

If the coolant is still present but the temperature warning light is on, prioritize checking the simpler issues first. I first confirm whether the coolant quality has deteriorated or become turbid, as insufficient concentration can lead to poor heat dissipation. Then, I check if the temperature sensor is damaged or dirty, causing false high readings. Next, I start the car to see if the cooling fan is working; if not, it might be a relay issue. Finally, I inspect the thermostat and water pump, feeling the hoses to detect temperature differences. I've done all these checks before, but a warning: don't randomly unplug wires, as the battery might get damaged. If the fan belt is loose, tightening it sometimes solves the problem. If there's air in the system, professional bleeding is needed, or there might be a leak that hasn't been fixed. If the engine temperature is high, don't drive—pull over and turn on the heater to help dissipate heat. Don't try to save money by handling complex issues yourself; it's safer to go to a repair shop.