How to Figure Out the 2012 Chrysler Town And Country 36 Serpentine Belt Diagram
You pop the hood of a 2012 Town and Country with the 3.6-liter Pentastar and immediately notice that the serpentine belt routing isn't labeled anywhere obvious. Chrysler stopped putting stickers under the hood on most vehicles around the early 2010s, and if you can't find one, you're basically expected to either memorize the routing or trace it from a diagram. This one isn't terrible, but it's not simple either, and a wrong guess on installation will just result in the belt falling off or the tensioner binding up. The 3.6L Pentastar in the 2012 Town and Country uses a single serpentine belt to drive the accessories. The belt wraps around the crankshaft pulley at the bottom, runs up and around the power steering pump pulley, crosses over the top to the alternator, drops down to the air conditioning compressor, then weaves through the tensioner and idler pulleys before returning to the crank. The A/C compressor pulley is one of the trickier ones to route around because of the tight clearance between the compressor body and the engine block, and this is where most people struggle when doing this for the first time. I've replaced the belt on maybe six or seven of these vans over the years, and the consistent pain point is always the same: you need to get the belt routed around the A/C compressor pulley and then into the tensioner's swing path simultaneously. The tensioner is a spring-loaded hydraulic unit bolted near the bottom of the engine, and it needs to be pulled clockwise with a standard 3/8-inch drive ratchet on its square bolt to release tension so you can slip the belt off. Reinstalling the belt requires doing the same thing in reverse, which means holding the tensioner with one hand while guiding the belt with the other. It is doable, but your right arm has to fit into a space that is not particularly generous.
The Practical Routing Path
Here's the sequence as it actually lays out on the engine, reading from the crank pulley going clockwise around the belt path. The belt leaves the crankshaft pulley and goes upward on the driver's side of the engine to the power steering pump. From there it runs across the front to the alternator pulley, then drops down toward the A/C compressor on the passenger side. The belt hooks under the A/C compressor pulley and then comes back toward the center of the engine where the tensioner sits. From the tensioner, it goes to a small idler pulley near the bottom, and finally returns to the crankshaft. That's the complete loop. The belt itself is a 6PK1975, which means it has six ribs and is approximately 1975 millimeters in effective length. When you buy a replacement, most of the aftermarket belts come with the routing diagram printed directly on the packaging or sometimes even on the belt's packaging insert, which is genuinely useful since you won't always have internet access while your van is on jack stands.
What Most People Miss
The first thing that catches people off guard is that the water pump on this engine is not driven by the serpentine belt. It's driven internally by the timing chain. Some people assume the belt goes around the water pump pulley because that's how it works on older Chrysler engines, and they'll end up with a belt that doesn't fit or they'll route it incorrectly and wonder why nothing is turning. The 3.6L Pentastar moved the water pump inside the timing cover, so it doesn't appear in the serpentine routing at all. If you see someone's diagram showing the belt wrapping around a water pump pulley, that's for a different engine or a different model year. A second counter-intuitive detail: the tensioner on this engine has a specific orientation that matters. The square drive bolt that you put your ratchet on should always be approached from the bottom, and the ratchet needs to swing clockwise to release tension. If you approach it from the wrong angle or try to push the tensioner counter-clockwise, you're either going to strip the tensioner arm or you're going to break the tensioner entirely. I learned that one the hard way on a 2011 model, and it cost me a $90 tensioner assembly that could have been saved with five minutes of reading the manual first.
Get the Full Details
Step-by-Step Replacement
Remove the engine cover first. It just pops off with your hands. Then locate the tensioner assembly at the lower front of the engine, driver's side. Attach a 3/8-inch drive ratchet to the square bolt on the tensioner and pull it clockwise to release the tension. While holding the tensioner in the released position, slip the old belt off the tensioner pulley and then work it free from the remaining pulleys. Take a photo with your phone before you do this. Even if you think you have the routing memorized, you won't. The A/C compressor section looks identical from both directions until the belt is already on. To install the new belt, start by routing it around all the pulleys except the tensioner and the A/C compressor. Get the belt seated on the crankshaft, the power steering pump, the alternator, and the idler pulley. Then you need to route it around the A/C compressor pulley, which requires angling the belt just right so it doesn't catch on the bracket above the compressor. Once it's hooked around the A/C pulley, apply clockwise tension to the tensioner again and slide the belt onto the tensioner pulley. Double-check every rib is seated in its groove before letting the tensioner slowly release. A belt that looks like it's on but is actually sitting crooked on one pulley will destroy itself within a few thousand miles and possibly take out the tensioner with it.
Common Problems and What They Mean
If you're searching for the belt diagram because your current belt is making a high-pitched squeal, that's usually a glazing issue. The belt surface gets hardened and slick, and it slips on the pulleys. A cleaning with a belt dressing product might buy you a week, but replacing the belt is the actual fix. If the squeal changes with acceleration or comes and goes with humidity, it's more likely the tensioner losing its grip. The tensioner on these Pentastar engines tends to start going around 80,000 to 100,000 miles, and I've seen a few fail as early as 60,000 on vehicles that do a lot of short-trip driving where the belt never fully heats up and self-adjusts. Another failure mode is belt shedding, where little chunks of rubber start flaking off the inner rib surface. This means the belt has been running under incorrect tension for a while, or one of the pulleys is misaligned. Check that the alternator and power steering pump pulleys are all in the same plane. If a pulley is bent from impact or improper installation, it will chew up any new belt you put on it within a few hundred miles.
Where to Find a Reliable Diagram
If you want a proper 2012 Chrysler Town And Country 36 Serpentine Belt Diagram, the most accurate source is either the under-hood emissions sticker if your van still has it, a factory service manual, or a trusted automotive diagram database like AllData or Mitchell1. Free diagrams on random blogs are often copy-pasted from forums and sometimes mixed up with the 3.5L engine routing, which is different. The 3.5L has a different pulley arrangement and a different belt length, so if you accidentally follow a 3.5L diagram on a 3.6L engine, the belt won't fit and you'll be standing in your driveway at midnight wondering what went wrong. The bottom line is that the routing isn't complex, but the physical space is tight and the margin for error is small. Take the photo, use the correct belt size, make sure the tensioner is releasing in the right direction, and verify every rib is seated before starting the engine. I've done this enough times that it takes me about twenty minutes now, but the first time someone does it solo without help, budget closer to forty-five minutes, mostly because of the wrestling with the A/C compressor section.
