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. 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. 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. Transmission Stop Leak Concentrate (1420).Power Steering Stop Leak Concentrate (1630).Oil Seal Engine Oil Burning & Leak Repair (OS-1).Heavy Duty Rear Main Seal Repair (1040).Engine Oil Stop Leak Concentrate (1010). Pelletized Heavy Duty Stop Leak (PLT11).Radiator Stop Leak 2X Concentrate (1194).Most standard filters are good for one year or 12,000-15,000 miles, but if you drive on a lot of dirt or gravel roads or live near a beach with a lot of sand in the air, then a quality performance filter with a lower micron rating and higher filtration efficiency might be the best engine air filter for your needs. Whether you install a single-use or performance filter depends on your driving habits and even the geography where you live. When it comes to choosing the air filter you need, check your vehicle owner’s manual for information on the exact type of air filter your engine requires, or you can use a parts search on the filter manufacturer’s website. It’s designed this way because the air filter has the critical task of stopping dirt, dust and harmful particles from entering your engine and threatening to cause severe damage.Ĭhoosing the right filter is crucial to getting the most protection and performance for your engine – it doesn’t matter if you’re just running errands in your old Honda Civic or packing up your Tundra for a long camping trip. Your engine air filter is specific to your engine size. Air Brake Compressor Air Strainer Filter.Automatic Transmission Vacuum Modulator.
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