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Symptom Chart - NVH

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .

Condition Possible Sources Actions
Excessive hissing from the plenum when the A/C is on Low refrigerant charge INSPECT the A/C system for a leak. REFER to: Electronic Leak Detection . REFER to: Fluorescent Dye Leak Detection . REFER to: Air Conditioning (A/C) System Recovery, Evacuation and Charging .
The A/C compressor is noisy A/C compressor clutch air gap out of specification CHECK and ADJUST the A/C compressor clutch gap if necessary. REFER to: Air Conditioning (A/C) Clutch Air Gap Adjustment .
If the A/C compressor clutch air gap is OK, INSTALL a new A/C compressor clutch and field coil. REFER to: Air Conditioning (A/C) Clutch and Air Conditioning (A/C) Clutch Field Coil .
A/C compressor pulley bearing worn INSPECT the A/C compressor pulley bearing for roughness.
If pulley bearing roughness is found, INSTALL a new A/C compressor pulley. REFER to: Air Conditioning (A/C) Clutch and Air Conditioning (A/C) Clutch Field Coil .
A/C compressor bearing worn INSPECT the A/C compressor bearing for roughness. If bearing roughness is found, INSTALL a new A/C compressor. REFER to: Air Conditioning (A/C) Compressor - 2.5L Duratec (125kW/170PS) .
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