Another sign we talk to customers about all the time is white exhaust smoke. Signs of this occurring include coolant residue on the spark plug insulator, which indicates that coolant has entered the cylinder and milky brown engine oil, which would prove that the head gasket has leaked. The likely reason is that coolant is being sucked into the head gasket and ejected from the exhaust. In this situation, the coolant repeatedly needs replenishing, despite there being no trace of oil or fluid on the ground. The other symptom involves leakage with no actual evidence. Empty Coolant Reservoir + No Signs of Leakage When worse comes to worst, the reservoir overflows, the coolant is lost and the system overheats. With no way to escape from the closed thermostat, gas pressure can mount inside the engine and cause a reverse flow of coolant through the radiator and back to the reservoir. When the system is cold, a head gasket leak could cause gasses to get trapped inside. When it does occur, however, one of the following symptoms is usually the cause: a cold system with gases trapped in a cold thermostat, or disappearing coolant with no apparent leakage. Head gasket leakage (also called a ‘blown head gasket’) is always a red flag, but the intensity of the problem can vary depending on engine temperature.
Coolant: From the Radiator to the Coolant Reservoir While this breath in/breath out effect brings air into the system, it also wears out the radiator over time. When pressure cycling occurs, coolant is forced by the radiator into the reservoir. Over time, pressure cycling can wear down the components of a cooling system.
#SUBARU COOLANT RESERVOIR FULL#
The old fashioned solution for cases like these would consist of soap and hosed water at low pressure, but today it’s wiser to visit a technician for debris removal, or perform a full radiator flush using a proven solution. When any kind of dirt or debris gets lodged between the radiator and A/C condenser, it hampers air flow. Despite the fact that most original equipment (OE) coolants are formulated to last beyond the 100k mileage mark, the anti–electrolytic additives can degrade and cause corrosion within the radiator. As with other vehicles manufactured overseas, clogs can easily form in the cooling tubes of Subaru radiators due to very thin cross-sections. If your Subaru overheats out on freeways and while driving up hills, it’s likely due to a lack of coolant flow to the radiator.
#SUBARU COOLANT RESERVOIR CODE#
If the car has ‘thrown a code,’ then it means the ECU has detected something awry and has logged a code so that techs can begin diagnosis. The codes give a very accurate, high-level picture of the engine’s condition. Today’s cars are basically rolling computers, and the ECU will ‘throw a code’ if it detects something is wrong with the engine. A code reader is essentially an embedded computer (called the ECU, or Electonic Control Unit) module that a dealership uses to scan the engine for ‘diagnostic’ codes so they can see what’s wrong at a glance. Either way, a fan can be diagnosed with the use of a code reader. By way of contrast, in domestically made applications, fan speeds are activated by the powertrain control module. With applications made abroad - including parts made by the Japanese automaker - the speed of the cooling fan is controlled by a pulse–modulated fan motor. Cooling Problems Due to Fan FailureĪs with most vehicles, if a Subaru overheats while being driven at slow speeds, it’s likely a failure of the cooling fan to power up completely. Fortunately, it’s possible to keep your Subaru in good driving condition as long as you have the proper information, perform the needed maintenance and keep reputable stop–leak products on hand should the need arise. Such has been the case with Subaru 2.5L models, which are known for cooling system issues.
Unfortunately, such problems are hard to identify, they’re costly to repair. Sometimes, however, things go awry, and a car experiences cooling problems that make it difficult - if not outright dangerous or impossible - to continue driving.
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