F-150 - Water Pump Replacement 🔧

This guide is for your 2015 F-150 5.0L with the stock, belt-driven mechanical water pump.

Safety & Prep ⚠️

• 🧯 Work on a cold engine only. Hot coolant can cause serious burns.
• 🔌 Disconnect the negative battery cable (10 mm) to avoid accidental starts.
• 🧤 Wear gloves and eye protection. Coolant is slippery and harmful if swallowed.

Parts You’ll Need 📦

• 🧊 Water pump assembly (5.0L Coyote, with new gasket/O-ring)
• 🧵 Water pump mounting bolts (Ford recommends new bolts)
• 🟢 Motorcraft Orange coolant (pre-mix or concentrate + distilled water)
• 🔁 Optional: new serpentine belt if yours is worn or cracked
• 🪫 Small amount of RTV silicone if specified with your pump gasket (many come with molded gasket and need no sealant)

Tools You’ll Need 🛠

• 🧰 Socket set (metric): 8 mm, 10 mm, 13 mm, 15 mm, 18 mm
• 🧰 Ratchets: 3/8" drive and 1/2" drive
• 🧰 Torque wrench (10–80 ft-lb range)
• 🧰 Serpentine belt tool or long-handled 1/2" breaker bar
  • This is a long bar that gives leverage to release belt tension.
• 🧰 Drain pan (at least 3–4 gallons capacity)
• 🧰 Flat-blade screwdriver or trim tool (for hose clamps and clips)
• 🧰 Pliers (for spring hose clamps)
• 🧰 Plastic scraper (to clean gasket surface without scratching aluminum)
• 🧰 Shop towels and brake cleaner (for cleaning surfaces)
• 🧰 Funnel and a clean jug for mixing coolant

Key Torque Specs 📏

• 🧷 Water pump bolts: 18 N·m (13 ft-lb)
• 🧷 Thermostat housing bolts (if removed): 10 N·m (89 in-lb)
• 🧷 Belt tensioner bolts (if loosened): 48 N·m (35 ft-lb)
• 🧷 Fan shroud / small brackets: 8–10 N·m (71–89 in-lb)

Step 1 – Drain the Coolant 🚿

• 🧊 Place the drain pan under the radiator drain (bottom of radiator, passenger side).
• 🧊 Remove the coolant reservoir cap to let air in.
• 🧊 Open the radiator drain petcock (small valve) by hand or with pliers and let coolant drain fully.
• 🧊 Close the petcock once drained. Do not overtighten; it’s plastic.

Step 2 – Remove Intake Ducting (If Needed) 🌬️

• 🛠 Loosen the hose clamps on the air intake tube at the throttle body and airbox (usually 8 mm or flat screwdriver).
• 🛠 Unplug any sensors on the tube (MAF, etc.). Press the tab and pull gently.
• 🛠 Lift the tube out and set aside. This gives more room at the front of the engine.

Step 3 – Remove the Serpentine Belt 🌀

• 🛠 Note or take a picture of the belt routing sticker under the hood.
• 🛠 Insert your belt tool or 1/2" breaker bar into the tensioner square hole.
• 🛠 Rotate the tensioner to relieve tension (usually clockwise) and slide the belt off the water pump pulley.
• 🛠 Let the tensioner return slowly. Remove the belt completely if it’s in your way.

Step 4 – Remove Fan Shroud / Obstructions 🧱

• 🛠 On many 5.0L trucks, you can access the pump with the fan shroud in place, but it’s easier with more room.
• 🛠 Remove the upper fan shroud bolts (usually 10 mm) and any clips holding wiring.
• 🛠 Lift the shroud up and out if needed. Be careful around the fan blades.

Step 5 – Disconnect Hoses from the Water Pump 🚰

• 🛠 Use pliers to squeeze the spring clamps on the upper and lower hoses attached to the pump and slide the clamps back on the hose.
• 🛠 Twist the hose gently to break it free, then pull it off. Use a flat screwdriver carefully if stuck, but don’t gouge the hose barb.
• 🛠 Expect more coolant to drain—keep the pan under the pump area.

Step 6 – Remove the Water Pump 🔩

• 🛠 Remove the water pump pulley bolts if needed (usually 10 mm). Sometimes you can leave the pulley on and remove the pump with it.
• 🛠 Remove all water pump mounting bolts (13 mm typically).
  • Note their lengths and positions; some may be different.
• 🛠 Gently tap the pump with a rubber mallet to break it loose if it’s stuck.
• 🛠 Pull the pump straight off the engine. More coolant may spill.

Step 7 – Clean the Gasket Surface 🧽

• 🧼 Use a plastic scraper to remove old gasket material from the engine block surface.
• 🧼 Do not use a metal scraper; it can gouge the aluminum and cause leaks.
• 🧼 Wipe with a clean rag and a little brake cleaner until the surface is clean and smooth.
• 🧼 Make sure no debris falls into the coolant passages.

Step 8 – Prepare and Install the New Pump 🆕

• 🛠 Install the new gasket on the pump.
  • If it’s a molded rubber gasket, install it dry.
  • If the instructions call for RTV, apply a very thin bead only where specified.
• 🛠 Position the pump on the engine, lining up the bolt holes.
• 🛠 Install all mounting bolts finger-tight first to avoid cross-threading.
• 🛠 Torque the bolts in a crisscross pattern to 18 N·m (13 ft-lb).
• 🛠 Reinstall the pulley if removed and tighten its bolts snug (about 18–20 ft-lb).

Step 9 – Reconnect Hoses and Reassemble 🧩

• 🛠 Reinstall all coolant hoses onto the pump fittings.
• 🛠 Slide the spring clamps back into place over the hose ends.
• 🛠 Reinstall the fan shroud and any brackets or wiring clips you removed. Tighten bolts to about 8–10 N·m (just snug).
• 🛠 Reinstall the serpentine belt following the routing diagram. Use the tensioner tool to slip the belt over the last pulley.
• 🛠 Reinstall the intake tube and plug in any sensors.

Step 10 – Refill and Bleed the Cooling System 🧊

• 🧪 Mix coolant if needed: 50/50 Motorcraft Orange and distilled water (unless you bought pre-mix).
• 🧪 Slowly fill the coolant reservoir to the “MAX” line.
• 🧪 Reconnect the negative battery cable.
• 🧪 Start the engine and let it idle with the heater set to full hot and fan on low.
• 🧪 Watch the temperature gauge and the coolant level. Add coolant as the level drops.
• 🧪 Let the engine reach operating temperature. Squeeze the upper radiator hose (carefully, it will be warm) to help burp air.
• 🧪 Once the level stabilizes and there are no bubbles, shut off the engine and let it cool completely.
• 🧪 Recheck the level when cold and top off to the “MAX” line if needed.

Step 11 – Final Checks ✅

• 🔍 Inspect around the water pump, hoses, and thermostat area for any leaks.
• 🔍 Check belt alignment and listen for any squeaks or grinding.
• 🔍 Take a short test drive, then recheck for leaks and coolant level once it cools again.

Tips for a First-Time DIYer 💡

• 🧠 Take pictures as you go so you remember hose and wiring locations.
• 🧠 Lay bolts out on cardboard in the pattern you removed them.
• 🧠 Never reuse old, crushed paper gaskets; they almost always leak.
• 🧠 Dispose of old coolant properly; pets are attracted to its sweet smell and it’s toxic.

HowToo makes it easy: Below this guide you’ll see the correct water pump, gasket, fresh coolant, serpentine belt, and the belt tool and torque wrench you can add to your cart for fast shipping.

If you want, tell me what tools you already have, and I can simplify the steps even more for your setup. 🧰