Faulty cooling fan: The cooling fan draws air through your radiator when your car isn’t going fast enough for air to pass through it on its own, such as in slow-moving traffic.It may have leaked outside the engine and you just can’t see it yet or it has leaked inside the engine where you normally would not see it, but it had to go somewhere. The cooling system is sealed and the coolant had to go somewhere. If the coolant is low, do not just top it off and forget about it. So check the coolant level regularly, make sure the ratio of water to coolant is correct per your owner’s manual, and have it changed every year. If you don’t have enough coolant running through the system due to leaks, ruptured hoses, loose hose clamps, whatever heat will build up, and your engine will overheat. Low coolant: Your engine relies on coolant to dissipate heat.The most frequent root causes of an overheating engine are: Possible Root Causes for Engine Overheating: Fan switch: The fan switch is a temperature sensor that switches the electric fan on and off.The cooling fan is not in use during cooler ambient temperatures or when the vehicle is running at speed. But all cooling fans only operate when needed. Some fans are electric and some are belt-driven. Cooling fan: This fan is used for drawing air through the radiator when the vehicle isn’t moving fast enough to force it through naturally.The thermostat then opens and allows normal coolant flow to the radiator, so it can be cooled. When the engine is cold, it holds the coolant in the engine until it is up to temperature. Thermostat: The thermostat controls the flow of coolant depending on its temperature.Most are belt driven, while a few are electric. Water pump: The water pump pushes coolant through the system.Hoses need to be regularly replaced as they become brittle and crack due not only to heat, but also to pressure in the cooling system. Radiator hoses: These hoses are used to move coolant from one component to another.This cooled liquid is then ready for another trip through the engine. After the mixture of coolant and water has traveled through the engine, it is pumped through the small, thin, flat tubes of the radiator, which are air-cooled. Radiator: The component where coolant goes to cool down. If any component in that system stops working and you ignore the problem, your car’s engine will be damaged beyond repair.Ī basic cooling system is made up of the following components: The hot liquid is then air-cooled to dissipate the heat, and the process repeats, over and over again. Are the condenser and rad fins clean? If you're still getting adequate AC performance then that would tell me the fins are clean, usually if the condenser fins get plugged up then you will get poor AC performance from the condenser not being able to release the refrigerants latent heat capacity.Every car has a system that circulates the engine coolant through the engine to absorb heat created by the combustion process and the friction created by moving parts within the engine. However at highway speeds usually a fan is not needed. The PCM may disengage the AC compressor clutch after a certain overheating temp is reached to reduce thermal load on the rad/cooling system. The fans should remain on when the AC is off depending on engine temp. The main one opens up at around boiling (100C). Do you have plenty of heat? Are the hoses to the heater core hot? There is a secondary thermostat in the tranny side of the block (right above the tranny in fact) that opens at a lower temp than the conventional/main thermostat, 83 degrees Celsius if i'm not mistaken. This avoids unecessary gas wasted on idling just to see if it opens. Keep in mind it takes a long time for the main thermostat to open, i would drive it as usual then after feel the rad hoses.
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