The most common indications that an automotive heater core is failing include a foggy windshield, steam coming from vents when the heater is switched on, a water surging sound inside the dashboard, a sweet-smelling aroma coming from the vents and wet carpeting on the front passenger side. Heater cores are responsible for extracting heat from the coolant and transferring warm air into the passenger compartment.Know More
Heater cores look like tiny radiators and heat passenger compartments by allowing hot coolant through small tubes with fins. Powerful fans then force air through these fins when heat is needed to warm passenger compartments.
There are several reasons why heater cores malfunction, but the common causes include continued temperature cycling from cold to hot which leads to leaky fittings, vibrations, rust build up and corrosion.
At times, low coolant levels and bad heater blowers are the culprits of insufficient heating. If warm air suddenly becomes cold while idling, inadequate coolant levels fail to reach heater cores that are normally mounted higher than an automobile's cooling system. This most often overlooked scenario could lead to clogging and eventual heater core failure.
According to Street Directory, flushing a clogged heater core sometimes improves efficiency, but replacing it is a better option.Learn More
There are a variety of signs of bad spark plugs including difficulty with starting an engine, a rough idle and an increased consumption of gas. Other signs include an engine that has a sudden surge when driving and difficulty with acceleration when applying the gas.Full Answer >
Signs of a bad ignition switch could include dashboard lights that come off and on, problems with the vehicle starting and a switch that is hot to the touch. A bad ignition switch can mimic other problems that are seen in a car, such as a faulty motor starter.Full Answer >
Symptoms of a bad ignition module are sudden engine stalling or power loss while the car is in motion, engine stuttering accompanied by a smell of gasoline and an inability to restart the engine following a stall. Decreased gas mileage is also a sign of a compromised ignition module.Full Answer >
Signs of a faulty catalytic converter include reduced fuel economy, excess engine heat, and impaired engine or exhaust performance. A visible fuel vapor over the carburetor intake, performance changes after the removal of oxygen sensors and increased carbon emissions from the converter are also warning signs.Full Answer >