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.
To effectively diagnose a coolant leak in your 1995 Mazda Miata, start with a thorough visual inspection of the engine bay and the area beneath the vehicle. Look for any visible signs of coolant, such as puddles or a white residue, which can indicate the presence of a leak. If nothing is apparent, proceed to perform a pressure test using a cooling system pressure tester; this method can reveal leaks that may not be visible under normal conditions. Next, carefully examine the radiator and hoses for any cracks, holes, or loose connections, as these are common culprits for coolant leaks. Don’t forget to check the water pump, as leaks can occur from the weep hole or gasket if it’s faulty. Additionally, inspect the heater core, especially if you detect a sweet smell inside the cabin or notice fogging on the windshield, which can signal a leak. Pay close attention to the head gasket as well, since a leak here can lead to coolant mixing with oil or exhaust gases, indicated by coolant in the oil or white smoke from the exhaust. If you still cannot locate the source of the leak after these steps, it may be wise to consult a mechanic for a professional diagnosis. This structured approach not only simplifies the process but also enhances your chances of successfully identifying and addressing the coolant leak.
When dealing with coolant leaks in a 1995 Mazda Miata, it's essential to understand the common problems that may arise. One of the primary culprits is worn-out hoses, which can develop cracks over time due to heat and pressure, leading to leaks. Additionally, a faulty radiator is often a significant source of coolant loss; corrosion or physical damage can compromise its integrity. The water pump, responsible for circulating coolant, can also fail, resulting in leaks as it ages. Another area to inspect is the radiator cap; a cracked or malfunctioning cap can disrupt the cooling system's pressure, causing coolant to escape. Furthermore, the radiator core itself may suffer damage from debris or corrosion, leading to leaks. Lastly, ensure that hose clamps are secure and undamaged, as loose or broken clamps can allow coolant to seep out. By identifying these common issues, DIYers can take proactive steps to address coolant leaks and maintain their Miata's performance.
Addressing a coolant leak in a 1995 Mazda Miata 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 quickly lead to overheating, which may result in severe engine damage. If the engine runs hot for an extended period, it can lead to catastrophic failures, necessitating costly repairs or even complete engine replacement. Additionally, a coolant leak can indicate underlying problems within the cooling system, such as a compromised radiator or a failing water pump, which can exacerbate the situation if not resolved promptly. Therefore, for DIY enthusiasts, it is crucial to diagnose and repair any coolant leaks immediately to ensure the safe and efficient operation of the vehicle, ultimately saving time and money in the long run.
See what others are asking about their Mazda Miata. Get answers from RepairPal's community of auto experts and enthusiasts.
Read about related problems experienced by other Mazda Miata drivers like you.
