In the bulk of cases, a thermostat simply fails from normal wear and tear. This stems from the fact that an engine in this condition will run cooler than normal, often leading to a relative loss in combustion efficiency. You might also notice a reduction in fuel economy if your engine’s thermostat has failed in the open position. This most prominently includes a “gurgling” noise, which occurs as coolant attempts to flow through a partially closed thermostat, or escapes from a radiator’s cap. In certain situations, a failed thermostat can cause an engine to make a number of odd noises. The remnants of this coolant can often be seen around the upper tank of an engine’s radiator. This scenario leads to a lack of coolant flow, causing coolant to boil over from a radiator’s cap. Coolant LossĪ sudden loss of coolant often comes as the result of a thermostat that is stuck closed. This occurs when an engine’s coolant fails to provide ample heater core temperatures. Lack Of Cabin HeatĪ thermostat that has failed in the open position can often be recognized by a general lack of cabin heat. A stuck closed thermostat will cause engine temperatures to skyrocket, while a stuck open thermostat will cause an engine to run cool. One of the most prevalent symptoms of thermostat failure is irregular operating temperatures. The following are several of the most common symptoms associated with thermostat failure. Recognizing these symptoms can prove beneficial when attempting to remedy the issue at hand. Faulty Thermostat SymptomsĪ faulty thermostat is often accompanied by many different symptoms, some of which tend to be far more severe in nature than others. Most engines now feature a dedicated thermostat housing, in which the thermostat itself is housed. However, this practice has now largely gone by the wayside. Some older vehicles actually housed the thermostat within the upper radiator hose itself. The exact location of an engine’s thermostat can be easily discerned by tracing the upper radiator hose to its mount with the engine itself. Where Is It Located?Ī vehicle’s thermostat is generally located near an engine’s water pump, at a junction with the cylinder head(s). This effectively regulates an engine’s internal temperature, thereby preventing overheating. Upon reaching its designated opening temperature, a thermostat springs open, allowing coolant to pass through a vehicle’s radiator, where excess heat is dissipated. This allows an engine to reach the ideal operating temperature much more quickly than would otherwise be possible. When the thermostat is closed, coolant circulates only within the engine itself, and all related fixtures, bypassing the radiator altogether. This temperature varies from one model of vehicle to the next. Thermostats are engineered to open at a specific temperature, deemed optimal by a vehicle’s manufacturer. The thermostat itself acts as a valve, designed to open and shut in relation to temperature. This is accomplished by regulating the flow of coolant between an engine and its accompanying radiator.
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