Symptom Chart: NVH

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to DIAGNOSTIC METHODS for information regarding Ford-specific diagnostic practices.

SYMPTOM DESCRIPTION - NVH

Condition	Possible Sources	Actions
Noisy A/C compressor	A/C compressor pulley bearing worn	INSPECT the A/C compressor pulley bearing for roughness. If bearing roughness is found, INSTALL a new A/C compressor. Refer to AIR CONDITIONING (A/C) COMPRESSOR - 3.5L TI-VCT, 3.7L TI-VCT or Refer to AIR CONDITIONING (A/C) COMPRESSOR - 2.0L GTDI or AIR CONDITIONING (A/C) COMPRESSOR - 3.5L GTDI .
Noisy A/C compressor	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 - 3.5L TI-VCT, 3.7L TI-VCT or Refer to AIR CONDITIONING (A/C) COMPRESSOR - 2.0L GTDI or AIR CONDITIONING (A/C) COMPRESSOR - 3.5L GTDI .
Excessive hissing from the front plenum when the A/C is on	Low refrigerant charge	INSPECT the A/C system for a refrigerant leak; Refer to FLUORESCENT DYE LEAK DETECTION or Refer to ELECTRONIC LEAK DETECTION .