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.
To effectively diagnose a coolant leak in your 1999 Oldsmobile Alero, begin with a thorough visual inspection of the engine bay and the area beneath the vehicle for any obvious signs of leakage. Focus on key components such as the radiator, hoses, water pump, and thermostat housing, as these are common sources of leaks. If no visible leaks are found, consider performing a pressure test on the cooling system, which can reveal hidden leaks that may not be immediately noticeable. Additionally, keep an eye on the coolant level; a consistent drop can indicate a leak. Look for any coolant pooling on the ground where you typically park, and check the overflow tube for signs of leakage, as this may point to a cooling system issue. It’s also prudent to inspect the intake manifold gasket, as this is a frequent leak source in Aleros. If you suspect a more serious issue, such as a head gasket failure, it’s best to seek the expertise of a professional mechanic for a comprehensive evaluation. By following this structured diagnostic approach, you can effectively identify and address the coolant leak in your vehicle.
When tackling a coolant leak in a 1999 Oldsmobile Alero, it's essential to understand the common culprits that could be at play. One frequent issue is loose hose connections, which can lead to coolant escaping under pressure. Inspecting these connections for tightness and wear can often resolve minor leaks. Another potential source of leaks is a broken radiator; cracks or punctures in the radiator can cause significant coolant loss, necessitating either a repair or replacement. Additionally, a failed water pump can contribute to leaks, as it is responsible for circulating coolant throughout the engine. If the water pump is malfunctioning, it may not only leak but also lead to overheating issues. Lastly, head gasket failure is a serious concern that can result in coolant leaking into the engine, which can cause severe damage if not addressed promptly. By systematically checking these areas, DIYers can effectively diagnose and remedy coolant leaks, ensuring their Alero runs smoothly and efficiently.
Addressing a coolant leak in your 1999 Oldsmobile Alero is not just a matter of convenience; it is a crucial step in maintaining the safety and functionality of your vehicle. Coolant plays a vital role in regulating engine temperature, and a leak can quickly lead to overheating, which poses a serious risk of engine damage. If left unchecked, the engine may run excessively hot, resulting in a breakdown or catastrophic failure that could require expensive repairs or even a complete engine replacement. Additionally, a coolant leak can diminish your vehicle's performance, leading to decreased fuel efficiency and further mechanical issues. By tackling a coolant leak promptly, you not only safeguard your engine's health but also save yourself from incurring higher repair costs in the future. Therefore, if you notice any signs of a coolant leak, it is imperative to address the issue immediately to ensure your vehicle remains safe and reliable on the road.
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