Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 362 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSENGINE OIL COOLER HOSE/PIPE REPLACEMENTREMOVAL PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Raise the vehicle. Support the vehicle with suitable safety stands.
Remove the retaining clip bracket nut.
For all gas engine, remove the engine oil cooler lines from the retaining bracket.

Fig 1: Removing Retaining Clip Bracket Nut
Courtesy of GENERAL MOTORS CORP.
For the 6.5L only, remove the bolt securing the engine oil cooler line from the retaining bracket.

Fig 2: Removing Bolt Securing Engine Oil Cooler Line From Retaining Bracket
Courtesy of GENERAL MOTORS CORP.
For the 4.3L only, remove the engine oil cooler line retaining bolt from the oil filter adaptor.

Fig 3: Removing Engine Oil Cooler Line Retaining Bolt
Courtesy of GENERAL MOTORS CORP.
Remove the retaining ring with bent-tip screwdriver or equivalent.

Fig 4: Removing Retaining Ring With Bent-Tip Screwdriver Or Equivalent
Courtesy of GENERAL MOTORS CORP.
Remove the engine oil cooler liner retaining clips in the following manner:
1. Using the bent-tip screwdriver or equivalent, pull on one of the open ends of the retaining ring in order to rotate the retaining ring around the quick connect fitting.
2. Rotate the retaining ring around the quick connect fitting until the retaining ring is out of position and can be completely removed.
Fig 5: Rotating Retaining Ring Around Quick Connect Fitting
Courtesy of GENERAL MOTORS CORP.

Important: When performing following service procedure, do not reuse the old retaining clips. Replace the old retaining clips with new ones.
Remove the retaining ring from the quick connect fitting in the following manner:
- Discard the retaining ring.
- Pull the engine oil cooler line straight out from the quick connect fitting.
Fig 6: Removing Retaining Ring
Courtesy of GENERAL MOTORS CORP.
For the 5.0L/5.7L only, remove the engine oil cooler lines from the oil filter adaptor, and repeat steps 5 through 7.

Fig 7: Removing Engine Oil Cooler Lines (5.0L & 5.7L)
Courtesy of GENERAL MOTORS CORP.
For the 8.1L only, remove the engine oil cooler lines from the oil filter adaptor, and repeat steps 5 through 7.

Fig 8: Removing Engine Oil Cooler Lines (8.1L)
Courtesy of GENERAL MOTORS CORP.
For the 6.5L only, remove the engine oil cooler lines from the oil filter adaptor and repeat steps 5 through 7.

Fig 9: Removing Engine Oil Cooler Lines (6.5L)
Courtesy of GENERAL MOTORS CORP.
Remove the engine oil cooler lines from the radiator, and repeat steps 5 through 7.

Fig 10: Removing Engine Oil Cooler Lines From Radiator
Courtesy of GENERAL MOTORS CORP.
Remove the engine oil cooler lines from the auxiliary oil cooler, and repeat steps 5 through 7.

Fig 11: Removing Engine Oil Cooler Lines From Auxiliary Oil Cooler
Courtesy of GENERAL MOTORS CORP.