What Is a Car’s EVAP System and How Does It Work?
Learn how a car’s EVAP system captures fuel vapor, what its main parts do, how leak checks work, and why faults can trigger a check engine light.
Systems Page 10
How engines, transmissions, brakes, suspension and electronics actually work.
Do Diesel Engines Have Spark Plugs? Glow Plugs Explained
Learn why diesel engines ignite fuel without spark plugs, how glow plugs support cold starts, and why starting trouble needs careful diagnosis.
Car Suspension Parts Names and What Each One Does
Learn car suspension part names, locations, and functions with an illustrated glossary covering arms, joints, links, mounts, and front and rear layouts.
What Is Inside a Catalytic Converter: Platinum, Palladium and Rhodium Explained
Explore the honeycomb, washcoat, and precious metals inside a catalytic converter, how they treat exhaust, and why small metal quantities contribute to its cost.
Transmission Cooler Lines: How They Work and Signs of Failure
Learn how transmission cooler lines carry fluid, how radiator cooling works, what leaks or fluid mixing can indicate, and what replacement involves.
Individual Throttle Bodies: Benefits, Filters, and K20 and Miata Builds
Learn how individual throttle bodies work, what shapes their response and sound, and what filters, tuning, and fitment mean for K20 and Miata builds.
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.
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.
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