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Why would a humming noise be coming from under the hood of 2003 Jetta only when AC is on and blowing cold car stopped in traffic if goes away upon acceleration?

Possible causes of a humming noise under the hood of a 2003 Jetta when the AC is on and blowing cold, but goes away upon acceleration:

- AC Compressor: The most common cause of a humming noise when the AC is on and the car stops is a faulty air conditioning compressor. The compressor is responsible for compressing the refrigerant, and if it fails, it can produce a humming sound.

- AC Condenser: The AC condenser is another component that can cause a humming noise. The condenser is responsible for dissipating heat from the refrigerant, and if it fails, it can also produce a humming sound.

- AC Compressor Clutch: The AC compressor clutch is a component that engages and disengages the compressor. If the clutch is failing, it can produce a humming noise when the compressor is engaged.

- AC Expansion valve: The expansion valve controls the flow of refrigerant into the evaporator. If it is clogged or defective, it can restrict refrigerant flow and cause the compressor to work harder, resulting in a humming noise.

- Power steering pump: The power steering pump provides hydraulic pressure for the car's steering system. If the pump is low on fluid or damaged, it can produce a humming noise. Check the fluid level in the power steering reservoir, and if it is low, add more fluid. If the noise persists, you may need to have the power steering pump replaced.

- Alternator: The alternator is responsible for charging the car's battery. If the alternator is faulty, it can produce a humming noise when the car is idling and draw more current from the engine, leading to acceleration-related noise changes.

- Cooling Fan: The cooling fan is responsible for cooling the engine. If the fan is damaged, it can produce a humming noise.

- Loose Belts or Pulleys: Humming noises in vehicles are often caused by belts or pulleys that have come loose or worn out over time. Ensure that all belts and pulleys are correctly tightened and undamaged.

If you are experiencing a humming noise from your car, especially when using the AC, it's important to inspect and confirm the cause. If the noise persists or you are unable to identify the cause, it's advisable to consult a qualified and experienced mechanic for proper diagnosis and repairs to prevent any potential issues or further damage to your car's components.

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