F 150 4WD Pickup V8-5.4L SOHC VIN 3 (1999)
9. Clean the O-ring grooves with a 300 mm (12 inch) length of natural fiber string.
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Loop the string around the grooves and pull the string back and forth.
10. Remove any debris from the grooves with a lint-free cloth.
CONNECT
1. Install the A/C tube lock coupling spring.
2. Lubricate the inside of the coupling with Motorcraft YN-12c Refrigerant Oil or equivalent meeting Ford specification WSH-M1C231-B.
3. Install the O-ring seals.
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Lubricate the O-ring seals with Motorcraft YN-12c Refrigerant Oil or equivalent meeting Ford specification WSH-M1C231-B.
CAUTION: Use only new green O-rings. The use of any O-ring seals other than specified may result in intermittent leakage during vehicle
operation.
4. Connect the spring lock coupling fittings with a twisting motion until the A/C tube lock coupling spring snaps over the flared end of the female
fitting.
