What Is a Dual-Clutch Automatic Transmission and How Does It Work?
Learn how a dual-clutch automatic transmission selects gears, what to expect in everyday driving, and which symptoms call for professional attention.
Systems Page 2
How engines, transmissions, brakes, suspension and electronics actually work.
Dex-Cool Coolant Explained: Uses, Compatibility, and Product Labels
Learn what Dex-Cool coolant is, how to confirm your vehicle requires it, what mixing can affect, and how to identify products meeting the required specification.
Champion Spark Plug Numbers Explained: RC12YC, RJ19LM and More
Understand Champion spark plug numbers, Copper Plus terminology, and common codes such as RC12YC and RJ19LM, with practical checks for correct engine fitment.
How Many Volts Is a Car Battery? 12V Explained
Understand a car battery’s 12-volt rating, resting and charging readings, amps, and cold cranking amps—and when battery testing is needed.
What Is Differential Fluid, What Does It Do, and Which Cars Have It?
Learn what differential fluid is, how it protects front and rear gear sets, how it differs from transmission fluid, and which drivetrains use a separate fill.
Radiator Hoses Explained: Upper vs Lower, Failure Signs and What Replacement Involves
Learn what upper and lower radiator hoses do, how to spot swelling, cracks, softness and leaks, and what replacing a coolant hose typically involves.
Mazda Turbochargers: Factory Turbo Models, Mazdaspeed 3 Problems and RX-8 Turbo Kits
Which Mazdas came with a factory turbo, what fails on Mazdaspeed 3 and 2.5T engines, how rotary turbos differ, and what Mazda3 and RX-8 turbo kits really involve.
Engine Oil Pump: How It Works, Failure Symptoms, and Replacement
Learn what the engine oil pump does, how to recognize the signs it is failing, when repair or replacement makes sense, and what to know about electric and LS oil pumps.
Radiator Cap Explained: What It Does and Why Pressure Matters
Learn how a car radiator cap holds cooling system pressure, raises the coolant boiling point, works with the overflow reservoir, and how to pick the right rating.
Car Tow Hitches Explained: Hitch Classes, Receivers, Wiring and Accessories
Learn how car tow hitches work, what hitch classes and receivers mean, how wiring harnesses and brackets fit together, and which towing accessories matter.
What Does a Water Pump Do in a Car? Function, Pulley, and Failure Signs
Learn what a car water pump does, how belts, pulleys, timing drives or electric motors turn it, and the whine, wobble, leaks and overheating that signal trouble.
Shocks vs Struts: What Is the Difference and Which Does Your Car Have?
Learn how shock absorbers and struts differ in build and job, why they are not interchangeable terms, and how to tell which one sits at each axle of your car.
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