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Radiator

The Radiator transfers heat from the hot liquid coolant, through its tubes, to the air blown through the fan. This process helps cool the engine. Problems that can go wrong with the radiator include leaks in the hoses, leaks in the radiator itself, a faulty fan, or obstructions in the cooling system.

Rear Defroster

There are two kinds of rear defrosters: one blows hot air against the rear window; the other is an application of thin lines crossing through your back window. These lines are actually small heating elements that slowly warm your window from the inside out.

Radial Tire

A Radial Tire is a tire design that utilizes plies arranged at a ninety-degree angle to the direction of travel. These plies are strong cords made of polyester, steel and other materials that help the tire hold its shape by preventing the rubber from stretching.

Radiator Core

Made of aluminum or copper, the radiator core is comprised of rows of tubes and serpentine fins that work to transfer heat to the cooling fan.

Radiator Hoses

Your car’s radiator hoses attach from the radiator to the engine, and from the radiator to the waterpump. As with any hoses under the hood, over time hoses can develop leaks at the seal and need to be replaced.

Rear Brake Type

Rear Brakes are typically drum brakes. This type of brakes has more parts than disc brakes and is harder to service, but they are less expensive to manufacture, and they easily incorporate an emergency brake mechanism. With drum brakes, fluid is forced into the wheel cylinder, which pushes the brake shoes against the drum, which is attached to the wheel. This friction causes the wheel and car to stop.

RWD (Rear Wheel Drive)

In Rear Wheel Drive cars, the back wheels do the pushing while the front wheels do the steering. This distributes the load of the car across all four tires. The advantage of having better weight balance overall is that it extends the life of your tires. You also get quicker acceleration and slightly better stopping capability.

Reservoir

A reservoir is a holding receptacle for liquid. The most important reservoir in your car is the container that holds your coolant for the radiator.

RPM

RPM stands for Revolutions Per Minute. In your car, RPM is used to measure the output of the engine. Anything below 800 RPM and your car is in idle. 1,000 – 5,000 RPM indicates standard output for accelerating and driving. 5,000+ RPM exceeds standard output and may put stress on your engine.

Rotor

The Rotor is the brake disk that attaches to the wheel of the car. In a disc brake system, the brake pad is pressed against the rotor with a set of calipers. The friction it causes enables the car to slow down and stop. If you let your brake pads wear out without replacing them, you risk damaging the rotor.

Rust and Corrosion Inhibitors

Rust and Corrosion Inhibitors are chemical compounds that protect against rust and corrosion on the exterior of metal parts and structural components.

R-134

R-134 is a type of refrigerant used in car air conditioning systems. It was designed to replace Freon, which is now banned because it depletes ozone in the environment.