A car's heater does not generate heat if the coolant level is low or restricted by buildup, if the water pump failed or if the thermostat is broken. The heater fan is also sometimes an issue.Know More
According to the Popular Mechanics website, a common cause of a car's heater not working is a buildup in the heater core. Grime or other sediment accumulate in the core and restrict the flow of heated coolant that serves as the source for the heater. The coolant needs to be flushed and replaced. This problem also occurs if the coolant is low, in which case it needs to be topped off.
Another possible problem is the thermostat. The thermostat controls a thermal valve that opens when the engine gets hot and closes when it gets cold. If the thermostat is worn out or broken, the thermal valve might remain open, which does not allow the coolant to warm up enough to provide heat for the heater. The thermostat then needs replacing. This problem also occurs if the water pump fails, in which case the car also overheats.
If the heater core is functioning properly but only a trickle of heat is coming from the vents, the problem might be the heater fan. Either the fuses for the fan or the whole fan might need replacing.Learn more about Car Parts & Maintenance
Coolant leaks and engine overheating are usually caused by a failing water pump. Automotive water pumps are designed to leak coolant through weep ports as a warning that they are failing. Aside from overheating, a distinctive grinding or whining noise caused by a bad bearing is also a symptom of a bad pump.Full Answer >
If a car will not turn over but the lights and radio still work, the problem is either a bad starter motor or a faulty ignition switch. A clicking noise when turning the key usually indicates a problem with the starter motor. No clicking sound and no sound from the engine can indicate a bad ignition switch. In both cases, the solution is to replace the faulty items.Full Answer >
A car can run without a thermostat. However, operating a vehicle without a thermostat may result in serious engine damage caused by the engine operating at too high a temperature.Full Answer >
A car dynamo converts mechanical energy into electrical energy. The dynamo uses a coil of metal wire rotated within a magnetic field to convert the mechanical energy into direct current using Faraday’s law.Full Answer >