This procedure covers the removal and replacement of a single freeze plug (core plug) on the 5.0L Coyote V8 engine, requiring partial disassembly to access the plug location.

Warnings

Tools required

Parts

• Engine freeze plug (cup type) × 1 — Use OEM specification - size varies by location
• High-temperature silicone sealant × 1 — Permatex 81160 or equivalent
• Engine coolant × 1 — Motorcraft Orange Coolant

Fluids

• Motorcraft Orange Coolant — 16 qt

Preparation

1. Park vehicle on level ground and engage parking brake
2. Allow engine to cool completely (minimum 2 hours after last operation)
3. Disconnect negative battery cable
4. Locate the specific freeze plug requiring replacement and assess access requirements
5. Raise and support vehicle on jack stands if accessing from underneath
6. Remove engine splash shield or skid plate if necessary for access
7. Place drain pan under radiator drain cock

Procedure

1. 1

   Drain Engine Coolant
   Open the radiator drain cock (petcock) at the bottom of the radiator and drain coolant into the collection pan. If the freeze plug is located low on the engine block, you may need to drain completely. For higher plugs, drain until coolant level is below the plug location. Remove radiator cap to speed draining.
2. 2

   Remove Components Blocking Access
   Based on freeze plug location, remove any components blocking access. Common obstructions include: alternator, starter motor, motor mount brackets, exhaust manifold heat shields, transmission cooler lines, or engine wiring harnesses. Label and photograph all connections before removal. For front-side plugs, removing the alternator is typically required. For rear-side plugs on 4WD models, you may need to remove the transfer case skid plate.
   ⚠Take photos of wiring harness routing before disconnecting to ensure correct reassembly.
   Torque spec

   Mounting Bolts34 Nm (25 lb-ft)
3. 3

   Disconnect Coolant Hoses if Required
   If coolant hoses obstruct access to the freeze plug, use hose clamp pliers to reposition clamps and carefully remove hoses. Be prepared for residual coolant spillage. Mark hose positions with tape to ensure correct reinstallation.
4. 4

   Clean Area Around Freeze Plug
   Use a wire brush and shop towels to clean the area around the failed freeze plug. Remove any rust, scale, or debris from the surrounding block surface. This provides better visibility and prevents contamination during installation.
5. 5

   Remove Failed Freeze Plug
   Using a freeze plug removal tool or a large punch and hammer, strike one edge of the freeze plug to rotate it inward and sideways within the bore. Once tilted, grip the edge with pliers or the removal tool and pull it out. Alternatively, drill a hole in the center and use a slide hammer. Be careful not to damage the bore surface in the engine block.
   ⚠Do not strike the freeze plug straight inward as this can push it into the engine block where it cannot be retrieved.
6. 6

   Inspect and Clean Freeze Plug Bore
   Thoroughly inspect the freeze plug bore in the engine block for damage, corrosion, or pitting. Clean the bore completely using a wire brush or emery cloth until bare metal is exposed. The bore must be clean, smooth, and free of rust for proper sealing. Wipe clean with a shop towel dampened with brake cleaner.
   ⚠If the bore is severely corroded or damaged, the block may need professional machining or oversize plug installation.
7. 7

   Prepare New Freeze Plug
   Verify the new freeze plug matches the bore size (typically 1.25 to 2.0 inches for Coyote engine). Apply a thin, even coat of high-temperature silicone sealant around the outer edge and sealing flange of the new freeze plug. Do not use excessive sealant that could be pushed into the cooling passages.
8. 8

   Install New Freeze Plug
   Position the freeze plug in the bore with the convex (cupped) side facing outward. Ensure it is square and centered in the bore. Using a freeze plug installation tool or a large socket slightly smaller than the plug diameter, carefully drive the plug into the bore. Tap evenly around the edges to ensure uniform seating. The plug should sit flush or slightly recessed (1-2mm) from the block surface, not protruding.
   ⚠Drive the plug straight in to avoid cocking it in the bore. An improperly seated plug will leak.
   ℹ️The torque specification refers to threaded expansion-type plugs. Cup-type plugs are installed by measured depth, not torque. Ensure the plug is seated to the correct depth per the installation tool or manufacturer specifications.
   Torque spec

   Freeze Plug10 Nm (7 lb-ft)
9. 9

   Allow Sealant to Cure
   Allow the silicone sealant to set according to manufacturer instructions, typically 15-30 minutes before filling with coolant. Do not disturb the plug during this time.
10. 10

    Reinstall Removed Components
    Reinstall all components removed for access in reverse order of removal. This includes coolant hoses, wiring harnesses, motor mount brackets, alternator, starter, or other components. Ensure all electrical connectors are fully seated and locked. Reinstall hose clamps and position them properly on hoses.
    ⚠Refer to photos taken during disassembly to ensure correct routing and connections.
    Torque spec

    Mounting Bolts34 Nm (25 lb-ft)

    Sensor Bolts14 Nm (10 lb-ft)
11. 11

    Refill Cooling System
    Close the radiator drain cock. Using a coolant refill funnel to prevent air pockets, slowly refill the cooling system with Motorcraft Orange Coolant (or equivalent approved coolant) mixed to proper concentration. Fill the radiator to the neck and the overflow reservoir to the COLD FULL mark. Capacity is approximately 16 quarts total, but actual refill amount depends on how much was drained.
12. 12

    Bleed Air from Cooling System
    With the radiator cap off and the coolant refill funnel still attached, start the engine and allow it to idle. Turn the heater to maximum temperature and fan to high. As the engine warms and the thermostat opens, air bubbles will rise to the funnel. Continue adding coolant as the level drops. When no more bubbles appear and the upper radiator hose becomes hot, the system is bled. Turn off the engine and allow to cool slightly before removing the funnel and installing the radiator cap.
    ⚠Monitor the temperature gauge closely during bleeding. Do not allow the engine to overheat.
13. 13

    Pressure Test for Leaks
    With the engine at operating temperature and the radiator cap installed, inspect the new freeze plug carefully for any signs of coolant leakage. Check all hose connections and components that were disturbed. If no leaks are observed after 5 minutes of operation, turn off the engine and allow to cool.

Reassembly

1. Reinstall engine splash shield or skid plates that were removed for access
2. Lower vehicle from jack stands if raised
3. Reconnect negative battery cable
4. Top off coolant reservoir to COLD FULL mark after engine has cooled completely
5. Dispose of used coolant properly at a recycling facility

Verification

• Check coolant level in the overflow reservoir with engine cold - should be at COLD FULL mark
• Start engine and verify no coolant leaks from the new freeze plug or any disturbed connections
• Verify heater produces hot air, confirming proper coolant circulation
• Monitor coolant level and temperature gauge during the first several drives
• Re-inspect the freeze plug for leaks after 50-100 miles of driving
• Verify all electrical components (alternator, sensors, etc.) are functioning properly

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