The optional oil cooler is either an integral part of the radiator or a separate unit placed in front of the radiator.
If an integral type cooler needs repair, refer to SEC­TION 6B2. Cooler lines and hoses are serviceable.
Refer to figures 39 through 43 for the applicable engine being serviced.

If foreign material has entered the oil cooler or if the engine has been damaged internally, flush the oil cool­er, connecting lines, and filter adapter assembly in the following manner.

Remove or Disconnect (Figures 39 through 46)
• Set the parking brake.
1. Oil cooler lines from the connector.
• Using a small pick-type tool and your thumb (A
in figure 45), grasp the connector end and pull
the clip from the connector (B in figure 45). This
releases the cooler line from the connector.

NOTICE: Do not use mom than 690 kPa (100 psi) air to clean the cooler and lines. Exceed­ing 690 kPa (100 psi) could damage the cool­er or lines.

A . Using clean solvent and compressed air, back-flush the oil cooler and lines.
B. Using compressed air, remove the cleaning sol­vent.
C. Flush the system using the same type of oil normally circulated through the cooler.

2. Bolt or nut from bracket or clamp.
3. Bolt and clip from its bracket (diesel engines only) figure 43.

4. Oil f i lter and discard.
5. Oil cooler lines from the clip or strap.
6. Oil cooler lines from the oil cooler at fitting.
7. Oil cooler line connector fittings at block (diesel only).

All components in a suitable solvent and dry with compressed air.

• All fittings, connectors, and cooler lines for damage or distortion.

Install or Connect (Figures 39 through 46)
• Using your thumb and forefinger, insert the connec­tor clip into one of the three recesses in the con­nector (C in figure 46). With one end of the clip engaged in the connector slot, use your thumb and rotate the clip around the connector until it snaps into place (D and E in figure 46).

NOTICE: Make sure the connector clip engages all three slots in the connector. Fail­ure to properly install the connector clip could cause the oil cooler line to come loose and cause damage to the engine.

1. Oil cooler lines to the oil cooler (gasoline engines).
Diesel engines install fittings into the block and use teflon sealer GM P/N 1052080 on the threads of the oil cooler lines.

• Oil cooler line fittings to 23 N-m (17 Ibs. ft.).
2. Oil cooler lines to the clip or strap.
3. Bolt and clip to its bracket (diesel engines only) figure 43 .

• Bolt to 6 N-m (53 Ibs. in.).
4. Bolt or nut to bracket or clamp.

• Bolt to 9 N-m (80 Ibs. in.).
• Nut to 13 N.m (115 Ibs. in.).
5. New oil filter.
• Test the flow of oil through the cooler before connecting the lines.
• If the flow is not restricted, connect the oil lines to the connector.

• A distinct “snap” should be heard when assembling the oil cooler line to the quick connector. The oil cooler line must be fully inserted into the quick connector. Check this by applying a forceful pull to the fitting.
• If the flow is restricted, replace the radiator. Refer to SECTION 6B2.

• Run the engine and check for leaks.


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