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
If a vehicle is overheating, a bad thermostat could be the problem, and a damaged thermostat housing is more likely to produce a coolant leak, either from a cracked or warped housing or a failed seal to the engine. The thermostat housing can be made of metal or plastic. And the housing can be a stand-alone part that is separate from the thermostat, or (on later model vehicles) can be integrated with the thermostat and replaced as a single unit.
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.
When troubleshooting coolant leaks in your Chevrolet Blazer, start by visually inspecting the engine bay and under the vehicle for any signs of leakage. Begin with the simplest checks, such as ensuring that all hoses are securely connected and free from cracks or wear. Pay close attention to the radiator cap, as a faulty cap can lead to pressure loss and coolant leaks. If you notice a decrease in coolant levels or colorful puddles beneath your vehicle, these are clear indicators of a leak. Next, examine the water pump and intake manifold gasket, as these components are common culprits in coolant leaks. If you detect sweet-smelling coolant, it’s crucial to address the issue promptly, as this can be harmful to pets and indicates a significant leak. By systematically assessing these areas, you can effectively identify the source of the leak and take appropriate action to prevent further damage to your engine.
When tackling coolant leaks in your Chevrolet Blazer, it's essential to understand the common problems that can arise within the cooling system. One frequent issue is the deterioration of hoses, which can lead to cracks and leaks over time due to heat and pressure. Additionally, worn hose connectors may fail to create a proper seal, allowing coolant to escape. Another common culprit is the radiator cap; if it’s broken or not sealing correctly, it can cause coolant to leak or evaporate. Head gasket failures, while less frequent, can result in significant coolant loss and engine damage if not addressed promptly. Similarly, a damaged heater core can lead to leaks inside the vehicle, often accompanied by a sweet smell of coolant. Lastly, the radiator itself can develop leaks from corrosion or physical damage. By being aware of these potential issues, you can more effectively diagnose the source of a coolant leak and take the necessary steps to fix it, ensuring your Blazer remains in optimal condition.
Fixing a coolant leak in your Chevrolet Blazer is not just a matter of convenience; it is a pressing concern that can significantly impact your vehicle's performance and safety. Ignoring the signs of a coolant leak, such as overheating or colorful puddles under your vehicle, can lead to severe engine damage and costly repairs. Overheating can cause critical engine components to fail, potentially resulting in complete engine failure. Additionally, a coolant leak can compromise the efficiency of your vehicle's cooling system, leading to further complications like damaged hoses or a broken radiator. By addressing a coolant leak promptly, you not only safeguard your engine's longevity but also enhance your vehicle's overall performance, preventing unexpected breakdowns and ensuring a safer driving experience. Therefore, if you notice any symptoms of a coolant leak, it is essential to take immediate action to maintain the health of your Chevrolet Blazer.
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