To replace the serpentine belt on a 2007–2017 Jeep Compass with the 2.4L engine, you will need to loosen the tension on the belt using the automatic belt tensioner. Because the engine bay is tight, this job is typically done by accessing the tensioner from the front passenger-side wheel well.
Before you begin, ensure you have a replacement belt and a tool to rotate the tensioner (such as a 3/8-inch drive ratchet, a breaker bar, or a dedicated serpentine belt tool).
1. Safety and Preparation
- Cool Down: Ensure the engine is completely off and cool to the touch to avoid burns.
- Disconnect Battery: Disconnect the negative battery cable as a standard safety precaution when working near pulleys.
- Safety Gear: Wear safety glasses and gloves to protect your eyes and hands from debris and sharp edges.
- Secure the Vehicle: Park on a level surface, engage the parking brake, and use wheel chocks on the rear wheels.
2. Accessing the Belt
- Raise the Vehicle: Use a floor jack to lift the front passenger side of the vehicle and secure it safely on a jack stand. Never rely solely on a hydraulic jack.
- Remove the Wheel: Remove the lug nuts and take off the front passenger wheel to clear your workspace.
- Remove the Splash Shield: Locate the plastic inner fender splash shield. Remove the push pins or bolts securing it to expose the lower engine pulleys and the belt tensioner.
3. Removing the Old Belt
- Locate and Study the Diagram: Look for a serpentine belt routing diagram sticker under the hood. If it is missing, draw a quick sketch or take a clear photo of how the belt wraps around each pulley (alternator, AC compressor, water pump, crankshaft, and tensioner) before taking it off.
- Release Tension: Find the automatic belt tensioner pulley. It features a hex cast into the tensioner arm. Place your wrench or serpentine belt tool onto the hex nut.
- Rotate the Tensioner: Rotate the tensioner arm clockwise (towards the front of the vehicle) to relieve the spring tension on the belt.
- Slip the Belt Off: While holding the tensioner open, slide the serpentine belt off the nearest accessible pulley (usually the idler or alternator pulley). Slowly release the tensioner arm back to its resting position.
- Extract the Belt: Pull the old belt out through the wheel well or from the top of the engine bay.
4. Installing the New Belt
- Route the Belt: Feed the new serpentine belt into the engine bay, wrapping it around all the pulleys according to your routing diagram, except for one easily accessible smooth pulley (like the water pump or tensioner pulley). Ensure the grooved side of the belt aligns perfectly with the grooved pulleys.
- Compress the Tensioner: Using your tool, rotate the belt tensioner clockwise once again to clear space for the belt.
- Slide the Belt On: Slip the final section of the belt over the remaining pulley.
- Check Alignment: Slowly release the tensioner arm so it applies pressure to the new belt. Before moving forward, visually inspect every single pulley to make sure the belt is perfectly centered and seated flat within the tracks.
5. Reassembly and Testing
- Reinstall the Splash Shield: Line up the plastic inner splash shield and secure it with the push pins or bolts.
- Mount the Wheel: Put the passenger wheel back on and tighten the lug nuts by hand. Lower the vehicle off the jack stands, then torque the lug nuts to factory specification in a star pattern.
- Test Run: Reconnect the negative battery cable. Start the engine and let it idle while keeping your distance. Watch the belt to ensure it runs smoothly without squealing, jumping, or misalignment.