2019 Jeep Wrangler Serpentine Belt Routing & Replacement Guide

Quick Answer

For the 2019 Jeep Wrangler with the 3.6L V6 engine, here's what you need to know about the serpentine belt:

• Belt Length: Varies depending on engine and options. For the 3.6L V6, it's typically around 86.5 to 87 inches.
• Rib Count: 6-rib
• OEM Belt PN: 68239054AB (for 3.6L V6, specific to some configurations – always verify with your VIN)
• Aftermarket Cross-references:
  • Gates K060865 (for 3.6L V6)
  • Dayco 5060865 (for 3.6L V6)
  • Continental Elite 4060865 (for 3.6L V6)
• Auto-Tensioner PN: 68239055AC (for 3.6L V6, always verify with your VIN)
• Idler Pulley PN: 53013759AD (for 3.6L V6, always verify with your VIN)

Belt Routing

The most critical step before attempting any serpentine belt replacement is to take a clear photograph of the existing belt routing on your 2019 Jeep Wrangler. This will serve as your invaluable guide during reinstallation.

For the 3.6L V6 engine in the 2019 Jeep Wrangler, a common routing path is as follows (always verify with your specific vehicle, as variations can occur):

1. Begin at the crankshaft pulley at the bottom center of the engine.
2. From the crankshaft pulley, the belt typically routes underneath the A/C compressor pulley.
3. From the A/C compressor, the belt goes over the top of an idler pulley (often located above the A/C compressor).
4. Next, the belt wraps underneath the alternator pulley (usually high on the passenger side).
5. From the alternator, it routes over the power steering pump pulley (if equipped, typically below the alternator).
6. The belt then goes around the water pump pulley (often located centrally).
7. Finally, the belt loops around the tensioner pulley, which provides the necessary tension to the system. The tensioner is usually spring-loaded and can be identified by its pivot point and a square hole for a serpentine belt tool or a 3/8-inch breaker bar.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2019 Jeep Wrangler (3.6L V6) is a moderate DIY task. Here's a general outline:

1. Safety First: Ensure the engine is off and cool. Disconnect the negative terminal of the battery for added safety.
2. Locate the Belt Tensioner: Identify the automatic belt tensioner. It will have a square opening designed to accept a serpentine belt tool or a 3/8-inch breaker bar.
3. Relieve Tension: Insert your serpentine belt tool or breaker bar into the square opening on the tensioner. Rotate the tool counter-clockwise (or clockwise, depending on the tensioner design – you'll feel it release tension) to pivot the tensioner and loosen the belt.
4. Remove the Old Belt: While holding the tensioner in the relieved position, carefully slip the old belt off one of the pulleys (e.g., the alternator or idler pulley).
5. Inspect Pulleys: With the belt off, take this opportunity to inspect all pulleys (alternator, power steering, A/C, water pump, idler, and tensioner) for any signs of wear, wobbling, or noise when spun by hand. Replace any worn pulleys.
6. Route the New Belt: Using the photograph you took earlier, carefully route the new belt around all the pulleys, leaving the tensioner pulley for last or a pulley that is easy to slip the belt onto.
7. Apply Tension and Install: Again, depress the tensioner with your tool. While the tensioner is held open, slip the new belt completely onto the final pulley. Slowly release the tensioner, ensuring the belt seats correctly in all grooves.
8. Double-Check Routing: Before starting the engine, visually inspect the belt routing to confirm it matches your diagram and is seated properly on all pulleys.
9. Reconnect Battery and Test: Reconnect the negative battery terminal. Start the engine and listen for any abnormal noises. Observe the belt's operation for a few minutes.

Replacement Interval

For most modern vehicles like the 2019 Jeep Wrangler, the serpentine belt is designed for longevity. However, it's generally recommended to inspect the serpentine belt every 30,000 to 50,000 miles or every 3-5 years, and consider replacement between 60,000 to 100,000 miles, or sooner if signs of wear are present. Always refer to your owner's manual for the manufacturer's specific recommendations.

Signs of a Failing Belt or Tensioner

Ignoring a failing serpentine belt or tensioner can lead to a breakdown, as it powers crucial accessories. Here are the warning signs:

• Squealing or Chirping Noises: This is one of the most common indicators. The noise might be more pronounced during cold starts, acceleration, or when the steering wheel is turned (if power steering is belt-driven).
• Cracks, Fraying, or Glazing on the Belt: Visually inspect the belt for any signs of wear. Small cracks across the ribs are normal with age, but deep cracks, missing chunks, fraying edges, or a shiny, glazed appearance on the belt are signs it needs replacement.
• Loss of Power Steering, A/C, or Charging System Malfunction: Since the serpentine belt drives these components, a broken or severely slipping belt will result in their failure. You might notice the power steering becoming very stiff, the A/C blowing warm air, or the battery warning light illuminating on your dashboard.
• Belt Wobbling or Jumping Out of Grooves: This often indicates a problem with the belt tensioner or a worn pulley.
• Tensioner Not Applying Sufficient Tension: If the tensioner arm doesn't appear to be applying adequate pressure to the belt, or if it's making a clunking noise, it may be failing.
• Grinding or Rattling Noises from Pulleys: Worn out idler pulleys or the tensioner itself can develop bad bearings, leading to grinding or rattling noises.

Note on Engine Variation: This guide primarily focuses on the 3.6L V6 engine, which is a common option in the 2019 Jeep Wrangler. If your Wrangler is equipped with a different engine (e.g., the 2.0L Turbo), the specific belt length, part numbers, and potentially the routing path will differ significantly. Always confirm parts with your vehicle's VIN.

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