2016 Ram ProMaster 3.6 Serpentine Belt Routing Diagram and Maintenance Guide

The 2016 Ram ProMaster 3.6 is equipped with a serpentine belt system that powers various engine accessories. A clear understanding of the belt diagram is necessary for accurate installation, maintenance, or troubleshooting of any belt-related issues. If you need to replace or inspect the belt, knowing the correct routing is crucial to avoid operational problems.
The serpentine belt on the 3.6L engine routes around key components such as the alternator, power steering pump, and air conditioning compressor. If the belt comes loose or wears out, it can lead to engine overheating, loss of power steering, or even engine failure. Ensuring the correct tension and routing will prevent these issues.
To view the exact routing for the 2016 Ram ProMaster 3.6, refer to the manufacturer’s diagram. This diagram provides a visual guide that details each component’s position relative to the belt, helping you avoid common installation mistakes. With the right tools and the correct routing, you can confidently tackle the task of replacing or adjusting the belt in your ProMaster.
2016 Ram ProMaster 3.6 Belt Diagram

The 2016 Ram ProMaster 3.6 uses a serpentine belt system that drives multiple components like the alternator, power steering pump, air conditioning compressor, and water pump. When replacing or servicing the belt, it’s crucial to follow the specific routing to avoid any potential damage to the engine components.
The diagram for the 3.6-liter engine typically shows the following sequence: the belt begins from the crankshaft pulley, loops over the alternator, and moves around the power steering pump. It then loops around the air conditioning compressor and follows the water pump, before returning to the tensioner. The tensioner pulley keeps the belt at the proper tension to ensure efficient performance.
Ensure the belt is correctly aligned with all pulleys and check for any signs of wear, such as cracks, fraying, or glazing. A misaligned belt could lead to reduced performance or failure of the components it drives. If you notice any wear or abnormal noise, replace the belt promptly to prevent more serious damage to the engine or accessories.
For accurate and up-to-date information, always refer to the vehicle’s owner manual or service guide when working on the belt system. If unsure about your ability to replace or adjust the belt, consult a professional mechanic to avoid unnecessary complications.
How to Identify the Components of the 2016 Ram ProMaster 3.6 Belt System
To properly identify the components of the 2016 Ram ProMaster 3.6 belt system, follow these steps:
- Locate the Serpentine Belt: The serpentine belt runs across the front of the engine, driving essential components like the alternator, power steering pump, and air conditioning compressor. It is the longest belt in the system and typically visible when you open the hood.
- Check the Belt Tensioner: The belt tensioner keeps the correct amount of tension on the serpentine belt. It is usually a spring-loaded pulley and can be found adjacent to the belt. The tensioner should be able to move freely when adjusted and should not show signs of wear such as cracking or excessive movement.
- Examine the Pulleys: Pulleys guide the belt around different components. Each pulley is mounted on a rotating shaft, often attached to accessories like the alternator or water pump. The pulleys should rotate smoothly and show no signs of rust or misalignment.
- Inspect the Idler Pulley: This pulley is stationary and helps maintain the correct belt alignment. It can be found on the same side as the tensioner. Listen for unusual noise from the idler pulley, which could indicate that it needs replacement.
- Alternator and A/C Compressor: These components are typically powered directly by the serpentine belt. The alternator helps charge the battery, and the A/C compressor circulates refrigerant for air conditioning. Both should spin freely when the engine is off.
- Water Pump: The water pump, which circulates coolant through the engine, is often driven by the serpentine belt. Check for any signs of leaks or unusual noise from the water pump, as these can indicate problems.
Take note of the belt routing diagram, usually found on a label near the front of the engine. This diagram shows the exact path of the serpentine belt and helps ensure everything is reassembled correctly during maintenance.
Step-by-Step Guide to Replacing the Serpentine Belt in the 2016 Ram ProMaster 3.6
Begin by disconnecting the negative terminal of the battery to prevent any accidental electrical shorts during the replacement process.
Locate the serpentine belt routing diagram. It’s typically found on a sticker on the radiator support or under the hood. This diagram will show you the correct path for the new belt.
Next, use a ratchet wrench and socket to release the tension on the belt. The 2016 Ram ProMaster 3.6 features an automatic tensioner. Place the socket on the tensioner bolt and rotate it counterclockwise to relieve tension. Carefully slide the belt off the pulleys, starting with the one closest to the tensioner.
Remove the old belt completely and inspect the pulleys for wear or damage. Check for cracks, chips, or debris that could cause the new belt to wear prematurely.
Compare the old serpentine belt with the new one to ensure they match in size and shape. Lay the new belt over the pulleys in the same route as shown in the diagram. Make sure the belt sits properly in each pulley groove to avoid misalignment.
With the new belt in place, rotate the tensioner again using your ratchet wrench to allow the tensioner to apply tension to the belt. Once it’s in place, check the belt’s alignment and ensure it sits snugly on all pulleys.
Reconnect the negative battery terminal. Start the engine and observe the belt while the engine is running to ensure smooth operation and proper tension.
Finally, check again for any abnormal noises or misalignment. If everything looks good, you’re finished!
Troubleshooting Common Issues with the 2016 Ram ProMaster 3.6 Belt System

If you’re hearing unusual noises coming from the belt system or experiencing performance issues, it’s likely due to one of the following common problems:
1. Loose or Worn Serpentine Belt
A belt that’s too loose or has visible wear can slip or even snap. Inspect the belt for cracks or signs of fraying. If the tension is off, it could indicate a failing tensioner or pulley. To fix this, replace the belt and check the tensioner for proper operation.
2. Faulty Belt Tensioner
The belt tensioner maintains the proper tension on the serpentine belt. If it’s not working correctly, the belt might not stay tight enough, causing slipping or squealing. A bad tensioner may not move smoothly, or you may notice excessive vibration in the system. Replace it if necessary, ensuring the new one fits the specifications for the 3.6 engine.
3. Misaligned Pulley
Misalignment of any pulley in the belt system can lead to wear on the belt and cause squeaking or grinding noises. Check each pulley for proper alignment by rotating them by hand. If one appears crooked or doesn’t rotate freely, it might need realignment or replacement.
4. Cracked or Seized Pulleys
If any of the pulleys are damaged or locked up, it can prevent the belt from running smoothly. Check for cracks, wear, or signs of damage on each pulley. Rotate them by hand to ensure they spin freely. Replace any pulleys that show signs of damage or difficulty rotating.
5. Misbehaving Alternator or Other Accessories
A malfunctioning alternator or accessory (like the AC compressor) can place extra strain on the belt system. If the alternator pulley is dragging or the AC compressor has failed, it can cause the belt to wear unevenly. Test each accessory to ensure it’s functioning properly and replace or repair the faulty parts as needed.
6. Incorrect Belt Installation
Improper installation of the serpentine belt can lead to many issues, from poor belt performance to damage to the engine components. Double-check the routing diagram for the 2016 Ram ProMaster 3.6 to ensure the belt is installed correctly. If it’s off by even a small amount, it can cause problems down the line.
Regular inspections and timely replacements of these components will keep your 3.6 belt system in optimal condition and help prevent costly repairs in the future.