How Does an Auto Mechanic Diagnose Problems?
A mechanic is a physician for your car. His first step in repairing any type of vehicle consists of evaluating the condition and issues with the car. Ultimately, this results in the diagnosis of the problems with your car, which leads to correction of the problem(s). There are multiple methods mechanics use to diagnose your vehicle.
Audio Evaluation
By listening to the car, a mechanic may establish that certain problems are occurring--especially engine troubles. Hearing certain noises during this process means different issues. For instance, squealing when you break more than likely indicates the wearing of brake shoes or brake pads. The grinding noise you hear means that the metal in the pad is exposed and is grinding against the rotor. Another instance of a noise signifying a problem is when the there is a clunking noise. The result may indicate one of many issues depending on the location of the noise. It possibly is an indicator of a loose motor mount or low transmission fluid.
Visual Assessment
In some occurrences, just looking at a car is enough to diagnose the problem. For example, red fluid leaking from the vehicles denotes the automobile is leaking transmission fluid, power steering fluid or coolant depending on the location of the liquid. A white steam coming from the car just might be the sign of a coolant leak. When a mechanic conducts a visual inspection underneath the hood, some problems jump right out such as a corroded leads on battery are the result of a bad battery.
Test Driving
A majority of the time your mechanic takes your car or truck for a test drive in order to detect certain issues including if the car needs a front-end alignment or if there is a power steering dilemma. For example, if the car veers to the left or right without turning the wheel this implies the car is out of alignment. Jerky or difficult steering may mean a power steering issue.
Diagnostic Testing
Sensors are common issue diagnosed via equipment testing. Batteries, engines and alternators test using certain pieces of equipment that indicates if the battery or other car part is malfunctioning or completely dead. Some computer testing is more general and tests why certain dashboard lights are on. If you suspect that you have a faulty part in your vehicle, you may take just that part in to the mechanic to have him or her test it.