KNOCKING NOISE FROM RF WHEEL AREA WHEN A/C IS ACTIVATED. A knocking noise is heard when entering drive readiness or after driving a short distance with the air conditioning activated. This only affects vehicles with a heat pump (option code 4T9). Note: The noise can only be reproduced once after a restart, then the vehicle must sit for some time before the noise can be heard again. Air Conditioning (A/C) receiver/dryer located near the RF wheel well area.
