Question 1

What does the engine do in a car?

Accepted Answer

Burns fuel and air to produce power. Modern import engines run at very tight tolerances and depend on clean synthetic oil at the right viscosity. Common failure signs: Knocking or ticking; Check Engine Light; Burning oil smell; Loss of power.

Question 2

What does the cooling system do in a car?

Accepted Answer

Radiator, water pump, thermostat, and hoses keep the engine in its 195–230°F operating window. Overheating warps aluminum heads in minutes. Common failure signs: Temp gauge high; Sweet coolant smell; Steam from hood; Coolant on ground.

Question 3

What does the transmission do in a car?

Accepted Answer

Manages power from engine to wheels. Modern ZF 8HP, DSG, CVT, and Aisin gearboxes all require the EXACT OEM fluid. Common failure signs: Harsh shifts; Slipping; Red fluid leak; Transmission warning light.

Question 4

What does the front brakes do in a car?

Accepted Answer

Pads squeeze rotors to slow the car. Front brakes handle 60–70% of stopping force and wear faster than rear. Common failure signs: Squealing or grinding; Pulsating pedal; Pulls when stopping; Brake warning light.

Question 5

What does the rear brakes do in a car?

Accepted Answer

Often pad-and-rotor too on imports. On some BMW and Audi, an electric parking-brake actuator is built in. Common failure signs: Parking brake won't release; Grinding from the rear; Uneven pad wear.

Question 6

What does the suspension do in a car?

Accepted Answer

Struts, control arms, bushings, and ball joints absorb bumps and keep the tire contact patch flat. Worn parts ruin tires fast. Common failure signs: Clunks over bumps; Steering wander; Uneven tire wear; Soft handling.

Question 7

What does the exhaust & cat do in a car?

Accepted Answer

Routes spent gases out and uses a catalytic converter to reduce emissions. Failure trips a CEL and hurts fuel economy. Common failure signs: Rotten-egg smell; Drone or rumble; Failed emissions test; CEL with P0420 / P0430.

Question 8

What does the battery & charging do in a car?

Accepted Answer

Battery + alternator power everything electrical. Most batteries last 4–6 years; alternators 100,000+ miles. Common failure signs: Slow crank; Battery light; Electronics flicker; Won't start after sitting.

Question 9

What does the a/c & heat do in a car?

Accepted Answer

Compressor, condenser, evaporator, and blower. ISA services R134a and 1234yf systems and runs electronic leak detection on every visit. Common failure signs: Warm air from vents; Hissing on shutdown; Foggy windows; Musty smell.

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