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.
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 Oldsmobile 98, begin by visually inspecting the most common leak sources, such as hoses and the radiator. Look for signs of wear, cracks, or dampness around these areas, as they are often the first to fail. If the hoses appear intact, check the water pump and the belt tensioner bracket, where plastic elbows can become brittle over time. If you suspect a more serious issue, such as a leak from the upper intake manifold, consider conducting a pressure test to identify any hidden leaks. Regular maintenance, including checking coolant levels and inspecting for leaks, can help you catch issues early, preventing overheating and costly repairs. By following this diagnostic approach, you can effectively address coolant leaks and keep your Oldsmobile 98 running smoothly.
When tackling coolant leaks in your Oldsmobile 98, it's essential to understand the common problems that can arise within the cooling system. Start by inspecting the hoses, as they are often the first culprits due to wear and tear over time. Look for any visible cracks or signs of deterioration. The radiator is another critical component; check for leaks around the seams and connections. Additionally, the water pump can develop leaks, especially if the seals are worn out. Pay attention to the area between the valve covers and the manifold, as oil puddles here can indicate a coolant leak. If you notice your engine overheating, it could be a sign of a malfunctioning radiator fan or a faulty thermostat, both of which can exacerbate coolant loss. Internal leaks, often caused by a bad head gasket, can lead to coolant entering the cylinders or crankcase, which is a more severe issue that requires immediate attention. Lastly, don't overlook the plastic elbows in the coolant system, as they can become brittle and crack, leading to leaks. By systematically checking these areas, you can effectively identify and resolve coolant leaks, ensuring your Oldsmobile 98 runs smoothly and efficiently.
Fixing a coolant leak in an Oldsmobile 98 is an urgent matter that should not be overlooked. Neglecting this issue can lead to severe engine overheating, which poses a significant risk of damaging vital engine components. When coolant escapes, it not only reduces the system's efficiency but can also indicate deeper problems such as a failing water pump or radiator issues. If these underlying problems are not addressed, they can escalate, leading to catastrophic failures like a combustion chamber leak. This can result in coolant mixing with engine oil, which can severely damage the piston, rings, and even the catalytic converter. Therefore, for anyone looking to DIY their vehicle maintenance, it is crucial to prioritize fixing coolant leaks promptly to ensure the longevity and safety of the Oldsmobile 98.
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