2017 Ford Fusion Serpentine Belt Diagram and Routing Guide

To replace or inspect the serpentine belt on a 2017 Ford Fusion, refer to the detailed belt routing diagram to ensure proper alignment. The serpentine belt drives multiple engine accessories, including the alternator, power steering pump, and air conditioning compressor. Proper installation is crucial for engine performance and to avoid unnecessary wear on components.
The belt routing diagram for the 2017 Fusion shows the path the serpentine belt follows around the various pulleys. Make sure to check the belt for signs of wear or cracks before installing a new one. A worn-out serpentine belt can lead to engine performance issues, so it is recommended to replace it every 60,000 to 100,000 miles depending on driving conditions.
When replacing the serpentine belt, ensure the tensioner pulley is functioning correctly to maintain proper tension. If the belt is too loose or too tight, it could cause premature wear on both the belt and the engine components. Using the correct belt size and following the routing diagram exactly will prevent unnecessary issues down the line.
2017 Ford Fusion Serpentine Belt Diagram
The 2017 Ford Fusion’s serpentine belt routing diagram is crucial for proper belt installation and maintenance. The belt powers essential components such as the alternator, power steering pump, air conditioning compressor, and water pump. Make sure the belt is routed correctly to prevent any component from malfunctioning.
To properly route the serpentine belt, follow the factory specifications in the manual. Start by locating the tensioner pulley, which is adjustable to allow the belt to be installed with proper tension. The belt should pass over the crankshaft pulley, then loop over the alternator, air conditioning compressor, and power steering pump pulleys, and end at the water pump pulley. Pay close attention to the belt’s alignment on each pulley to avoid skipping or damaging the belt.
If you’re replacing the belt, it’s essential to check the condition of the pulleys and tensioner. Worn pulleys or a faulty tensioner may cause premature wear on the new belt. Regular inspection of the belt and pulleys will ensure the system runs smoothly and prevent unexpected breakdowns.
In case of belt misalignment or unusual noise, immediately inspect the tensioner and pulleys. These issues can result in belt wear, affecting performance and reliability. Replacing the serpentine belt at recommended intervals will keep your 2017 Ford Fusion in good working condition.
Identifying Key Components in the 2017 Ford Fusion Serpentine Belt System

The serpentine belt system in the 2017 Ford Fusion plays a critical role in powering various components like the alternator, power steering pump, and air conditioning compressor. To ensure optimal performance, it’s important to familiarize yourself with the key components of this system.
Serpentine Belt: This is the main belt that drives multiple accessories. It’s routed around pulleys to transfer engine power. Regular inspection for wear or damage is vital to avoid unexpected breakdowns.
Idler Pulley: The idler pulley keeps the belt under tension and ensures it runs smoothly. If the pulley wears out or becomes misaligned, it can cause slippage and lead to belt failure.
Tensioner: The tensioner applies pressure to the belt to maintain proper tension. A malfunctioning tensioner can result in belt slack, leading to slipping and, eventually, system failure.
Alternator Pulley: This pulley is attached to the alternator and is responsible for keeping the electrical system running. If the alternator pulley fails, the battery may not charge properly, which can lead to engine performance issues.
Air Conditioning Pulley: The air conditioning system is powered by a dedicated pulley that allows the serpentine belt to drive the compressor. If this pulley is damaged, it can affect the cooling system’s efficiency.
Power Steering Pulley: This component assists in making the steering process easier by powering the steering pump. A failing pulley can result in heavy steering, making driving difficult.
Inspecting these components regularly and replacing any damaged or worn parts can help maintain the efficiency and longevity of the serpentine belt system in your 2017 Ford Fusion.
How to Properly Route the Serpentine Belt on a 2017 Ford Fusion
To route the serpentine belt on a 2017 Ford Fusion, follow these steps carefully to ensure proper installation.
- Locate the belt routing diagram. It is usually found on the front of the engine bay or on the radiator support. This diagram will provide the exact routing path and direction for the belt.
- Ensure the tensioner pulley is in the released position. You may need a ratchet or serpentine belt tool to release the tension on the tensioner pulley.
- Start by placing the belt over the crankshaft pulley. Make sure the grooves align with the pulley’s teeth for proper grip.
- Route the belt clockwise over the components as per the diagram. Begin with the crankshaft, move over the alternator, power steering pump, and idler pulleys, ensuring each pulley is positioned correctly.
- Ensure the belt fits snugly into the grooves of each pulley. Double-check that the belt doesn’t sit on top of any pulleys or off-center.
- Once the belt is routed correctly, release the tensioner pulley to allow the belt to tension automatically.
- Inspect the belt to make sure it is aligned and seated properly in each pulley. The belt should sit firmly without being twisted or misaligned.
Once you have routed the belt, manually rotate the engine by turning the crankshaft pulley to ensure the belt runs smoothly. If the belt is misaligned or makes unusual noises, recheck the routing and tension.
Common Issues with the Serpentine Belt and How to Fix Them
Squeaking or Chirping Noises: If you hear squeaking sounds while the engine is running, the serpentine belt may be misaligned or worn. Check the tension and ensure the belt is properly routed on all pulleys. If the belt shows signs of wear, such as cracks or fraying, replace it immediately. Tightening the tensioner may also help if the noise persists.
Slipping Belt: A slipping serpentine belt can cause various electrical and mechanical issues, such as poor power steering or malfunctioning air conditioning. This is usually due to a worn-out belt or improper tension. Inspect the belt for signs of glazing (a shiny, smooth surface), and replace it if necessary. Adjust the tensioner to ensure the correct amount of tension on the belt.
Belt Wear and Cracking: Over time, exposure to heat, dirt, and other environmental factors can cause the belt to crack and degrade. Examine the belt closely for any visible damage. If cracks, fraying, or glazing are present, replace the belt to avoid further damage to other engine components.
Broken Belt: A broken serpentine belt will cause the engine’s accessory components, such as the alternator, power steering pump, and air conditioning, to stop functioning. If this occurs, replace the belt immediately. Make sure the tensioner is in good condition to prevent future breakage.
Excessive Belt Tension: If the serpentine belt is too tight, it can strain the tensioner and other engine components, leading to premature wear. Check the tensioner and pulley alignment, and adjust the belt tension if needed to ensure proper operation.
Damaged Tensioner or Pulley: A faulty tensioner or pulley can lead to belt misalignment or premature wear. Inspect these components for any signs of damage or excessive wear. If any issues are found, replace the faulty parts to restore proper belt operation.