How To: Replace the Serpentine Belt, Tensioner, and Idler Pulley on a 2009 to 2014 Ford F-150

These step-by-step instructions and video detail a serpentine belt replacement on a 2012 Ford F-150 XLT, and will be similar for Ford F-150 models equipped with a 5.0-liter engine from 2011, 2013, 2014, 2015, and 2016, which includes the King Ranch, Lariat, Platinum, XL, STX, FX2, and FX4 submodels. The replacement procedures will be similar to Ford Focus models with a 2.0-liter engine from 2000- 2011, Ford Mustang models from 2011- 2016, and Jeep Wrangler models from 2000 to 2006. Replacing a damaged or failing serpentine belt, tensioner, or idler pulley helps you maintain a safe, functioning drive belt system and keeps the belt driving your accessories. If you notice your truck is making excessive squealing noises from under the hood, overheating, or if you see cracks or damage on the serpentine belt, it should be replaced. The belt tensioner or idler pulley may also seize and result in a loose belt or belt damage, and you should perform a full serpentine belt and belt tensioner replacement to keep your truck running right.

Supplies Needed for This Job:
1. Safety Glasses: https://orly.cc/4e7cFKz
2. Gloves: https://orly.cc/3YKu3QZ
3. Serpentine Belt: https://orly.cc/4aX9q8K
4. Tensioner: https://orly.cc/3WSmTc1
5. Idler Pulley: https://orly.cc/3QwQDI1
6. Ratchet and Sockets: https://orly.cc/3Odkxji

0:00 Welcome Back
0:45 Tips
1:06 Access the Belt
1:36 Remove the Belt
1:52 Remove the Tensioner
2:06 Remove AC Belt
2:19 Remove AC Tensioner
2:28 Replace the Idler Pulley
2:46 Install New AC Belt & Tensioner
3:09 Install New Tensioner
3:19 Install the New Belt
3:38 Replace Intake Tube

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Your Ford F-150’s serpentine belt, tensioner, and idler pulley are important parts of your truck’s belt drive and accessory operation. With proper tension, the serpentine belt uses movement from the crankshaft pulley to power the accessory drive on your truck, which includes the alternator, water pump, A/C compressor, and power steering pump. If you notice a cracked, loose, or worn belt, excessive belt noise, or shallow grooves on the pulley contact surface of the belt, you may have a failing or worn serpentine belt that will need to be replaced. A broken serpentine belt can cause engine overheating, a lack of power steering or A/C, or stalling that could leave you stranded. It is suggested that you replace the serpentine belt, idler pulley, and belt tensioner at the same time since they are often the same age and will likely have the same amount of wear. Our step-by-step instructions will help you perform a serpentine belt replacement on your Ford F-150.

Park on a level surface… and open your hood.
For easier access, disconnect the hoses and electrical connector. Then remove the air intake tube.

If your A/C compressor belt uses a tensioner, here’s what you’ll do:
Attach a 15mm socket on your breaker bar to the tensioner. Then rotate it counterclockwise to relieve tension on the belt.

Once tension has been relieved, you can remove the belt.
If you’re also replacing the tensioner, which is usually advised when the belt is replaced, it can also be removed with a 14mm socket.

To remove the main serpentine belt, insert your 3/8 drive breaker bar or ratchet into the tensioner. You may need to use an extension to reach it. Then, rotate clockwise to relieve tension on the belt… and slide the belt off of the pulleys.

We also recommend the idler pulley be replaced if it’s worn or if the tensioner and belt are being replaced to ensure a complete, long-lasting repair.

To replace the idler pulley, remove the bolt and reinstall the new idler… then torque it to 18 ft lbs
Before reinstalling the accessory serpentine belt, install your new tensioner using a 10 mm socket and torque the bolt to 35 ft. lbs.

Now, route your belt according to the belt routing diagram in your owner’s manual or under the hood...


View full video for complete instructions*