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.
Systems Page 7
How engines, transmissions, brakes, suspension and electronics actually work.
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.
What a Catalytic Converter Is and What It Does
Learn what a catalytic converter does, how it treats three exhaust pollutants, and why modern gasoline vehicles use it to control emissions.
What Is an Oxygen Sensor and How Does It Work in a Car?
Learn what a car's oxygen (lambda) sensor is, how its zirconia element makes a signal, narrowband vs wideband basics, and why the ECU needs it for fuel trim.
What Does a Power Steering Pump Do? Types and How They Work
Learn what a power steering pump does, how a vane pump builds pressure, how belt-driven, electric and combined vacuum-pump designs differ, and what affects pump life.
Cabin Air Filter vs Engine Air Filter: What Each Does and Whether Your Vehicle Has Both
Learn how a cabin air filter differs from an engine air filter, where each sits, what each protects, clog symptoms, and how to tell if your car, SUV or truck has one.
What Is Windshield Washer Fluid Made Of? Ingredients, Colors and Safety
Learn what windshield washer fluid contains, why it beats plain water, what pink, orange and purple mean, and how concentrates, tablets, flammability and shelf life work.
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