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.
When troubleshooting coolant leaks in your Chevrolet Trailblazer EXT, it's essential to adopt a methodical diagnostic approach. Start by visually inspecting the engine bay and undercarriage for any signs of coolant pooling or staining, which can indicate the leak's location. Check the condition of the hoses and connectors, as these are common culprits; look for cracks, bulges, or loose fittings. Next, examine the radiator cap for any signs of wear or damage, as a faulty cap can lead to pressure loss and leaks. If these components appear intact, move on to more complex areas such as the head gasket and heater core, which may require a more thorough inspection or even a pressure test to confirm their integrity. Remember, while temporary fixes like sealants or tape can provide a short-term solution, they should not replace proper repairs. By systematically assessing each component of the cooling system, you can effectively identify and address the source of the leak, ensuring your vehicle remains in optimal condition and preventing further complications down the line.
When dealing with coolant leaks in a Chevrolet Trailblazer EXT, 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 develop cracks over time due to heat and wear, leading to leaks. Additionally, worn hose connectors may fail to create a proper seal, allowing coolant to escape. A broken radiator cap is another common culprit, as it can fail to maintain the necessary pressure within the system, resulting in coolant loss. More severe issues, such as a blown head gasket, can also manifest as coolant leaks, often accompanied by other symptoms like engine overheating or white smoke from the exhaust. Furthermore, the heater core, which is responsible for providing heat to the cabin, can develop leaks that may not be immediately visible but can lead to significant coolant loss. Lastly, a faulty radiator can contribute to leaks, especially if it has developed corrosion or physical damage. By being aware of these common problems, DIYers can more effectively diagnose and address coolant leaks, ensuring their Chevrolet Trailblazer EXT remains in optimal condition.
Addressing a coolant leak in your Chevrolet Trailblazer EXT is not just a matter of convenience; it is a pressing issue that demands immediate attention. Ignoring a coolant leak can lead to severe overheating, which poses a significant risk to your engine's integrity and can result in costly repairs or even complete engine failure. The symptoms of a coolant leak, such as white smoke emanating from the engine, indicate that coolant is entering the combustion chamber, a situation that can severely compromise engine performance and longevity. Additionally, a decrease in coolant levels can hinder the engine's ability to maintain optimal operating temperatures, further exacerbating the risk of overheating. Common causes of coolant leaks, including loose hose connections, a damaged radiator, or a malfunctioning water pump, require prompt investigation and repair to prevent further damage. By addressing these issues swiftly, you not only safeguard your vehicle's performance but also protect your investment from the financial burden of extensive repairs down the line.
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