Replace the coolant temperature sensor (CHT/ECT sensor) on the 5.0L Coyote V8 engine to restore proper engine temperature monitoring and cooling system operation.

Warnings

Tools required

Parts

• Coolant temperature sensor (CHT or ECT) × 1 — Motorcraft DY1169 or equivalent
• Coolant temperature sensor O-ring × 1 — Use OEM specification

Fluids

• Motorcraft Orange Coolant — 2 qt

Preparation

1. Ensure engine is completely cool to the touch (minimum 2 hours after last operation)
2. Park vehicle on level ground and engage parking brake
3. Locate the coolant temperature sensor on your specific engine (consult service manual diagram if needed - position varies by model year)
4. Place drain pan under radiator drain petcock or coolant drain plug
5. Have replacement sensor and O-ring ready to minimize coolant loss

Procedure

1. 1

   Remove Engine Cover
   Remove the plastic engine cover by pulling upward on the cover to disengage the mounting grommets. Set aside in a clean area.
2. 2

   Relieve Cooling System Pressure
   Slowly rotate the radiator cap counterclockwise to the first stop and allow any residual pressure to escape. Once pressure is fully released, press down and continue rotating to remove the cap completely.
3. 3

   Drain Partial Coolant
   Position drain pan under the radiator. Open the radiator drain petcock or remove the coolant drain plug at the bottom of the radiator. Drain approximately 1-2 quarts of coolant, or enough to bring the coolant level below the sensor location. Close the petcock or reinstall drain plug when sufficient coolant has drained.
   Torque spec

   Coolant Drain Plug15 Nm (11 lb-ft)

   Drain Petcock8 Nm (6 lb-ft)
4. 4

   Disconnect Sensor Electrical Connector
   Locate the coolant temperature sensor and identify its electrical connector. Press the release tab on the connector and pull straight away from the sensor to disconnect. Move the wiring harness aside to provide clearance.
5. 5

   Remove Old Sensor
   Using the appropriate socket (typically 19mm or 22mm depending on sensor type), carefully unthread the coolant temperature sensor from its housing. Turn counterclockwise to remove. Have a shop towel ready to catch any coolant that drains from the opening. Remove and discard the old O-ring from the sensor or housing bore.
6. 6

   Clean Sensor Bore
   Use a wire brush or clean shop towel to clean the sensor threads and mounting bore in the housing. Remove any old coolant residue, corrosion, or debris. Ensure the sealing surface is clean and free of damage.
7. 7

   Install New Sensor
   Install the new O-ring onto the replacement sensor if not pre-installed. Lightly lubricate the O-ring with fresh coolant. Thread the new sensor into the housing by hand until finger-tight, ensuring it threads smoothly without cross-threading. Snug the sensor with a socket - do not overtighten as these sensors typically do not have a specified high torque value and rely on the O-ring for sealing. Tighten to approximately 10-15 lb-ft or until firmly seated.
8. 8

   Reconnect Electrical Connector
   Reconnect the electrical connector to the new coolant temperature sensor. Push firmly until you hear or feel the locking tab click into place. Gently tug on the connector to verify it is securely locked.
9. 9

   Refill Coolant System
   Using a funnel, slowly add Motorcraft Orange Coolant to the radiator or coolant reservoir to restore the proper level. Fill to the cold fill line on the reservoir. Start the engine and allow it to reach operating temperature with the radiator cap off. Add coolant as needed as air bleeds from the system. The Coyote engine typically self-bleeds; monitor coolant level during warm-up.
   Torque spec

   Bleed Screw8 Nm (6 lb-ft)
10. 10

    Check for Leaks
    With the engine at operating temperature, carefully inspect the coolant temperature sensor for any signs of leakage around the O-ring seal. Check coolant level and top off if necessary. Allow engine to cool, then reinstall the radiator cap securely.
11. 11

    Reinstall Engine Cover and Clear Codes
    Reinstall the plastic engine cover by aligning the mounting posts with the grommets and pressing down firmly until seated. If a check engine light is illuminated, use a code reader to clear any diagnostic trouble codes related to the coolant temperature sensor.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify radiator cap is installed securely after final coolant check
3. Double-check that drain petcock or drain plug is fully closed and torqued properly
4. Wipe down any coolant spills from engine components and surrounding areas

Verification

• Start the engine and verify it reaches normal operating temperature (approximately 190-210°F) on the dashboard gauge
• Confirm no check engine light or temperature warning lights are illuminated on the instrument cluster
• Visually inspect the sensor installation area for any coolant leaks after reaching operating temperature
• Use a scan tool to verify the coolant temperature sensor is reading properly (should match actual engine temperature within 5-10 degrees)
• Check coolant level after engine cools completely and top off if necessary
• Test drive vehicle and monitor temperature gauge for normal operation under load

More procedures for this vehicle