Reasons for Engine Overheating While Both Upper and Lower Radiator Hoses Remain Cool
2 Answers
Reasons for engine overheating while both upper and lower radiator hoses remain cool: The thermostat is damaged and fails to open properly, preventing the coolant in the radiator from circulating with the coolant in the engine, resulting in engine overheating. Thermostat Introduction: It is a valve that controls the flow path of the coolant. It is an automatic temperature-regulating device, usually containing a temperature-sensing component that opens or closes the flow of air, gas, or liquid through thermal expansion or contraction. Coolant Pump Introduction: Suitable for conveying water or liquids with physical or chemical properties in high-pressure operating systems, such as water supply for high-rise buildings, boiler feedwater, HVAC refrigeration cycles, hot and cold water circulation pressurization for bathrooms and equipment, and firefighting systems for conveying or pipeline pressurization. Hard alloy seals made of different materials ensure leak-free transportation of various media.
I've been driving for over 20 years and have encountered several instances where the engine overheated but the coolant hoses remained cold. This is mostly due to cooling system issues, such as a stuck thermostat that fails to open. The thermostat is responsible for opening to allow coolant circulation once the engine warms up. If it's stuck closed, the coolant just circulates inside the engine without flowing out, so the hoses stay cold while the engine overheats. Additionally, if the water pump fails or the belt is loose, it can't pump the coolant, preventing circulation and causing overheating. Sometimes, low coolant levels or air bubbles in the system can block the pipes, interrupting flow and causing localized engine overheating. This problem shouldn't be ignored—you need to shut off the engine immediately and check the thermostat and water pump. Otherwise, the engine can quickly sustain serious damage, leading to costly repairs. Regularly checking coolant levels during maintenance can help prevent such issues.
