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Procedure 1 — Ambient Temperature At or Below 38°C (100°F) NOTE: The system performance can be evaluated and diagnosed by analysis of the compressor suction and discharge pressures. The following procedure is used to determine if the system is operating at normal pressures. NOTE: The procedure varies depending on the ambient (shop) temperature. If the ambient temperature is 38°C (100°F) or lower, follow procedure 1. If the ambient temperature is over 38°C (100°F), follow procedure 2. NOTE: If the A/C compressor cycles at any time during this test, refer to the diagnostic table. 1. Drive the vehicle or run the engine until it reaches normal operating temperature. 2. Connect a manifold gauge set or refrigerant service center with high-pressure and low-pressure gauges to the refrigerant system.

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To replace the fuel pump, proceed as follows: 1. Remove the inlet and outlet lines at the pump. 2. Use a plug to stop the flow of fuel from the tank. 3. Use a socket wrench to remove the mounting bolts, then remove the pump from the engine. 4. Clean the old gasket material hem the engine block. 5. Apply gasket sealer to the mounting surface on the engine and to the threads of the mounting bolts. 6. Install the new gasket. 7. Position the pump by tilting it toward or away from the block so that the bulge in the cam eccentric is facing away from the lever or pushrod. If the pump is driven by a pushrod, the rod must be held up to permit the rocker arm to go under it. The pump is properly positioned when there is an internal squeaking noise with each movement of it. 8. Tighten the mounting bolts. 9. Attach the inlet and outlet lines, then start the engine and check for leaks.

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When carbon deposits build up inside the combustion chamber, two problems can occur. Knock, or ping, sounds like marbles being dropped into a metal can. It is loudest when the engine is accelerating or climbing a hill. The second problem is afterrun (or dieseling) when the engine is shut off. Engine carbon cleaner loosens carbon from the combustion chamber in order to reduce knock and afterrun. There are two ways to use it: 1. Pour it into the gas tank. 2. With the engine running at warm idle, allow the cleaner to dribble slowly into the carburetor or fuel injection barrel. On engines with catalytic converters, the air pump belt must be disconnected first. NOTE: In late-model cars, knock and afterrun are often caused by problems in the emission, fuel, and/or ignition systems. These systems should be checked before engine carbon cleaner is used.

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To replace a strut back into the MacPherson suspension, proceed as follows: 1. Extend the piston rod on the new strut (or cartridge) to its full length. 2. Reinstall the coil spring and other components in the reverse order that they were removed. Make sure the spring is positioned properly on the lower spring seat. MODIFIED MACPHERSON STRUTS To replace a strut on a modified MacPherson suspension, proceed as follows: 1. Raise the car and support the lower control arms with a jack or jack stands. 2. Remove the upper shaft nut, but not the upper strut mount retaining bolts. If a mount rivet is used, do not remove it either. 3. Remove the brake caliper. If necessary, unbolt the strut from the spindle. 4. Remove the strut assembly and upper mount. Discard the strut assembly. 5. If the upper mount has a rubber jounce bumper inside the dust shield, inspect it and replace if damaged.

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Models: 1992-94 Buick Skylark 1993-96 Buick Park Avenue 1989-92 Cadillac Allante 1991-93 Cadillac Eldorado, Seville 1991-95 Cadillac DeVille 1991-95 Oldsmobile Ninety Eight 1992-93 Oldsmobile Achieva 1994-99 Pontiac Bonneville This bulletin is being revised to clarify when this bulletin may be used to turn the service suspension lamp off. Also, a step has been added to the 1991 Cadillac Eldorado and Seville repair. Please discard Corporate Bulletin Number 00-03-11-001 (Section 3 – Suspension). Some owners may bring their vehicles in for service with an illuminated service suspension light. The service suspension indicator lamp is telling the owner that the vehicle is due for strut/shock replacement, a maintenance item. The customer may elect to have passive struts installed in their vehicles due to repair cost savings and/or parts availability. The installation of passive shock/struts will result in handling characteristics which are the equal to a like vehicle without the computer controlled ride, with all other components such as tires, tire pressure, springs, etc. being equal. The installation of (4) new passive struts will cause the continued illumination of the service suspension indicator. If desired by the customer, the service indicator may be disabled AFTER THE INSTALLATION OF THE (4) NEW PASSIVE STRUTS, using the appropriate service procedure listed below. This bulletin DOES NOT authorize this procedure unless (4) NEW PASSIVE STRUTS WERE INSTALLED ON THE VEHICLE.