Symptom Chart - NVH

WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.

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 or a low refrigerant charge. 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. 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 .