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Unusual sound coming from the back of a Ford Expedition?
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★ Top Answer
The main reason you might hear a knocking sound coming from the back of a Ford Expedition is often due to problems with the shocks or struts. As they wear out over time, they can produce knocking and smacking sounds when navigating rough terrain or hitting bumps on the road. If it's not the shocks or struts, the issue could be related to the rear differential. Damaged gears in the differential can cause abnormal noise while driving. To determine if it's the differential causing the noise, pay attention to whether the sound disappears when you release the gas pedal. If it does, then the problem likely lies with the gears in that area.
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While the rear heater or air conditioner is on in the Ford Expedition, it is common for the rear HVAC unit to make a loud banging, ticking, or clicking noise.
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