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Suspension Coil Spring Replacement Service and Cost. What is a coil spring? Coil springs allow the vehicle to absorb bumps, and keep the passenger comfortable. The coil springs hold the weight of the vehicle, and allow the wheels to travel vertically when the wheels encounter an obstacle.
, 40 years as an electrical engineer. A coil spring is a spring made by bending a strand of wire (might be big or small) into a multi-turn coil. A screen door spring is a coil spring. Some automobiles use coil springs in the suspension system. Also many beds for sleeping use coil springs in the mattress or box spring.