Coolant Reservoir and Overflow Tank: How It Works, Why It Overflows, and Replacement
Learn what the coolant reservoir does, how to read its level, why coolant overflows or flows back, and what replacing a cracked overflow tank involves.
Systems Page 5
How engines, transmissions, brakes, suspension and electronics actually work.
Engine Oil Basics: What It Does, Motor Oil vs Engine Oil, and What the Numbers Mean
A beginner guide to engine oil: what it does inside an engine, what it is made of, whether motor oil is the same thing, and how to read grades like 5W-30.
NGK Spark Plug Part Numbers Explained (BPR6ES, BPR5ES, CMR6H and More)
Learn how NGK spark plug codes such as BPR6ES, BPR5ES, CMR6H and D8EA are built, what each letter and number position means, and how to read an NGK chart correctly.
What Is a Manual Transmission and How Does It Work?
A beginner's guide to the manual transmission: what stick shift means, where the gearbox sits in a car, and how the clutch and gears move engine power to the wheels.
Remote Car Starters Explained: How They Work and What Installation Involves
Learn what a remote engine starter does, which vehicles it suits, what a kit includes, how installation works, and how to weigh DIY versus professional fitting.
Coolant vs Antifreeze vs Radiator Fluid: Are They the Same Thing?
Antifreeze, coolant and radiator fluid are often used for the same liquid. Learn what each word means, what coolant is made of, what it does and whether it degrades.
What a Timing Belt Is and What It Does in Your Car's Engine
Learn what a timing belt is, how it keeps the crankshaft and camshaft in sync, how it differs from a chain, and why interference engines raise the stakes.
Oil Pressure Sensor, Switch and Sending Unit: How They Work and Failure Symptoms
Learn how oil pressure sensors, switches and sending units differ, what a failing unit looks like, why they leak, and when a mechanical pressure test is needed.
What Is an EGR Valve and What Does It Do? A Beginner's Guide to Exhaust Gas Recirculation
Learn what an EGR valve is, why engines recirculate exhaust to cut NOx, how the valve opens and closes, what it looks like, and how it differs from a purge valve.
ABS Light On: What It Means and Whether It Is Safe to Keep Driving
What the ABS warning light means, how it differs from the red brake light, what changes when anti-lock braking is off, and how long you can reasonably keep driving.
What Refrigerant Does Your Car AC Use? R-134a, R-1234yf and Freon Explained
Understand car AC refrigerant, what Freon means, where to confirm your vehicle’s required type, and why correct refrigerant and compressor oil matter.
What the Check Engine Light Means: The Malfunction Indicator Lamp Explained
Learn what the check engine light means, how to recognize its symbol, and why the malfunction indicator lamp is part of your car’s diagnostic system.
Recently viewed
Your latest 12 modifications and trims, stored in this browser.