![]() More so, coolant also doesn’t stay long in the radiator to cool before flowing back to the engine. In the case of overheating, if the valve remains open, coolant flows into the hot engine but doesn’t stay long enough to cool before flowing back to the radiator. However, when it is permanently closed or open, there will be an inappropriate or disrupted coolant flow. Usually, the valve is supposed to stay closed and open only when it needs to let in or let out coolant, depending on the engine’s temperature. The overheating and overcooling issues in a Cummins ISX often stem from a thermostat valve stuck in the close or open position. Overheating and coolant issues in Cummins ISX With the most prominent being a gurgling noise. Strange noises occur due to coolant trying to force its way through a closed or partially closed thermostat or boiling out through the radiator cap due to a closed valve. ![]() Invariably leading to higher fuel consumption. Because the engine runs cooler than usual, you may notice a drastic increase in exhaust emissions. Reduced fuel economyĪ bad thermostat in the open position may never let your Cummings ISX reach its optimal operating temperature. So don’t always assume the thermostat is the issue. However, while a bad thermostat stuck in the close position can result in coolant leaks, other issues can also be responsible. If it were in the engine, it would escape via the thermostat housing and the radiator cap if it was inside the radiator. This invariably results in coolant overflow, causing coolant to escape from either the thermostat housing or radiator cap, depending on where the coolant was when the thermostat closed. The thermostat valve stuck in the close position will limit the flow of coolant. While a faulty thermostat can stay stuck in the open position, most of the time, it stays closed. While overheating is caused by coolant not entering the engine when needed, overcooling occurs due to coolant entering the engine when not needed Coolant leaksĪnother telltale sign of a bad thermostat is coolant leaks. One minute your engine’s temperature is high, and the other minute is low, which you will also feel in the cabin.Įrratic temperature change is caused by valves stuck in the close or open position causing the engine to either overheat or over cool. Thermostat failure will cause a drastic fluctuation in the whole cooling system. Your car will alert you about your Cummins ISX high temperature via the reading in the temperature gauge showing an unusually high number. If, however, the sensor is bad, it may send a wrong signal to the ECU, tricking the ECU into thinking that the engine is not hot enough to get coolant. The ECU then makes adjustments based on this information. The Cummins ISX coolant temperature sensor mounted on the thermostat housing and back of the outlet hose helps relate the engine temperature to the ECU. Not letting the coolant stay long enough to cool the engine before flowing back to the radiator and vice versa.Ī bad coolant temperature sensor can also lead to high temperatures. Similarly, an open valve will cause an unregulated flow of coolant in and out of the engine. A closed or partially closed valve will not let fluid into the engine to cool it, eventually making it very hot. High engine temperature in a Cummins ISX can be caused by the thermostat valve stuck in the close or open position. That said, common Cummins ISX bad thermostat symptoms include high temperature, erratic temperature change, coolant leaks, decreased fuel economy, etc. In other cases, it could be a broken or stuck valve, a bad thermostat sensor, etc. However, it can go bad for several reasons ranging from a bad battery, normal wear, and tear due to its work cycle, or even age. ![]() ![]() As the coolant cools the engine and becomes hot, the thermostat releases it back to the radiator to cool again. When the engine’s temperature rises, the thermostat opens up and lets in coolant from the radiator. The thermostat is a temperature-cooling device that helps control the temperatures in an engine with a cooling system. So here are Cummins ISX bad thermostat symptoms to look out for if you want your engine to work effectively. So it’s no news that vehicle owners with the Cummins ISX complain of thermostat issues. Technically, like every other vehicle, the thermostat is mounted on the engine block and helps regulate coolant flow in and out of the radiator. While the Cummins ISX engine is considered a workhorse, many drivers have complained about its issues, some of which are caused by a bad thermostat. And features in big applications like pickup trucks, trailers, tractors, etc. The Cummins ISX is one of the best engines from Cummins. ![]()
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