The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.
When the head gasket begins to fail, the engine may have no symptoms at all. They only begin to occur when the leak has reached an engine oil passage, engine coolant passage or the engine cylinder.
When that happens, the engine may be very difficult to start, and run roughly when idling. There may be oil or coolant leaking, and the engine may begin to overheat, or at least run hot. At this point, there may be coolant in the engine oil pan — this will look creamy and lighter in color than the oil. Also, the radiator or engine coolant reservoir may have a gurgling sound, the presence engine oil, or smell of combustion. And the check engine light will come on.
The coolant being burned in the engine will produce white exhaust that smells sweet, like engine coolant. When the head gasket fails completely, the engine will overheat within minutes of starting, will stall and then won't restart.
A failing heater core may cause the car's interior to smell like engine coolant. The smell will become worse when the heater is turned on. The engine may also begin to run hotter until the vehicle is repaired.
The worst-case scenario is the engine overheating, which can cause extensive engine damage.
If the heater core is clogged, the air that blows when the heater is turned on will not be very hot.
Problems with the intake manifold gasket can create the following symptoms:
» LEARN MORE: Intake manifold gasket symptoms
A failing radiator can cause the engine to run hot or overheat. Most radiators are made of metal and plastic. The plastic parts can become brittle and crack over time, causing a leak of coolant (typically green or pink in color). All manufacturers have a recommended service interval for coolant renewal. As the coolant ages, the additives breakdown and being to form solid deposits. These deposits will build up in the passages of the cooling system and will eventually clog components, including the radiator. A leaking or clogged radiator must be replaced. Some automatic transmission cars will also have a transmission cooler integrated into the radiator. Lines going to and from the transmission circulate transmission fluid to help cool the transmission in heavy duty applications such as towing or off-roading. If this integrated cooler fails, it can allow transmission fluid and coolant to mix. This will causing shifting issues in addition to overheating.
A coolant leak may be noted from the hoses. Coolant hoses can be damaged by oil leaks, or age. This will lead to swelling or cracking, it is suggested to replace the hoses before they begin leaking to avoid potential overheating.
The bad thermostat can cause two different sets of problems, depending on whether it's stuck open or stuck closed.
A thermostat that is stuck open can cause the engine to run colder than normal and turn on the check engine light. It may also cause poor fuel mileage and the heater to blow cool air.
A thermostat that is stuck closed will cause the vehicle to overheat. If a new thermostat doesn't resolve engine temperature problems, the cooling system needs to be checked for other issues.
» LEARN MORE: Signs of a bad thermostat, and how to fix it
The two most common signs of a bad pump are leaks and noises.
Leaking water pumps can result in damage to the drive and timing belts, and cause the engine to overheat. A failed water pump can be caused by other problems in the cooling system, such as a bad thermostat, radiator or head gasket.
To effectively diagnose a coolant leak in your 2008 Mazda 6, start with a thorough visual inspection of the vehicle. Look for any visible signs of coolant on the ground beneath the car, as this can provide immediate clues about the leak's location. Next, carefully examine the radiator and hoses for any cracks, holes, or loose connections that could be contributing to the problem. If no obvious leaks are found, consider performing a pressure test on the cooling system, which can help identify leaks that are not visible to the naked eye. Additionally, inspect the water pump and heater core, as these components are common sources of leaks. Don’t forget to check the radiator cap to ensure it is sealing properly, as a faulty cap can also lead to coolant loss. Throughout this process, monitor the coolant levels in the reservoir; a consistent drop in levels can indicate a leak. If you still cannot locate the source of the leak after these steps, it may be time to consult a mechanic for a professional diagnosis and repair. This systematic approach not only helps in identifying the issue but also ensures that you address simpler problems before moving on to more complex diagnostics.
When dealing with coolant leaks in a 2008 Mazda 6, it's crucial to understand the common problems that may arise. One of the primary culprits is a damaged radiator, which can develop corrosion over time, leading to leaks. Additionally, a faulty water pump can contribute to coolant loss, either through the pump itself or its gasket. Worn-out hoses are another frequent issue; as they age, they can crack or deteriorate, resulting in leaks. It's also important to check the hose clamps, as loose or damaged clamps may fail to create a proper seal, allowing coolant to escape. Another potential source of leaks is the heater core, which can develop leaks and affect the vehicle's heating system. In more severe cases, a cracked engine block may be the source of the problem, leading to significant coolant loss. Addressing these issues promptly is essential to prevent overheating and potential engine damage, making it vital for DIYers to inspect these components regularly.
Addressing a coolant leak in a 2008 Mazda 6 is of utmost urgency due to the significant risks associated with neglecting this issue. Coolant plays a vital role in maintaining the engine's temperature, and a leak can lead to overheating, which may result in severe engine damage or even complete failure. Ignoring a coolant leak not only compromises the vehicle's cooling system but also increases the likelihood of costly repairs down the line. Additionally, a coolant leak can indicate underlying problems, such as a damaged radiator or a failing water pump, which can exacerbate the situation if not resolved quickly. Therefore, for DIY enthusiasts, it is crucial to act swiftly when a coolant leak is detected to ensure the vehicle's safety, performance, and longevity. Taking immediate action can prevent further complications and protect your investment in the vehicle.
Read about related problems experienced by other Mazda 6 drivers like you.
See what others are asking about their Mazda 6. Get answers from RepairPal's community of auto experts and enthusiasts.
