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Automotive air conditioners lose efficiency over time. This is because an air-conditioning system will lose a small amount of rigerant, or freon, each year. Over the course of a few years, the system will lose enough that youll notice the air is not as cold as it should be. Adding an amount as small as a 1/2 pound can help restore air conditioner function.

Instructions

1

Raise the hood of the vehicle. The air-conditioning system will have two service ports: a high side and a low side. The low side service port will have a blue cap on it. Both ports are located near the top of the engine compartment and should be visible.

2

Remove the blue cap from the low side service port. Inside is a schrader valve, which looks similar to a tire valve that you use to inflate tires. The cap is threaded onto the line and must be unscrewed.

3

Place the side of the low-pressure hose with the valve over the top of a can of rigerant. Lock it in using the handle or screws that come with the hose. Dont turn the valve yet. Thread the other end of the hose over the low-pressure service port, tightening it by hand.

4

Start the engine of the vehicle and turn the air conditioning to high. Turn the valve on the low-pressure hose clockwise as far as it will go to pierce the top of the can. Turn it counterclockwise to open the valve and allow the rigerant to flow into the system. Shake the can gently as you do this and throughout the charging process. In about one minute, the can will be empty.

5

Close the valve on the low-pressure hose by turning it clockwise. Remove the low-pressure hose from the schrader valve and replace the cap. Check the operation of the air-conditioning system after a few minutes.

The 1989 model year brought a complete redesign of Nissans flagship sedan, the Maxima. Experts considered this version of the Maxima the most beautiful to date, and it was also significantly larger than previous models. The 1989 Maxima uses just one oxygen sensor to monitor the level of oxygen in the exhaust and send this information to the electronic control unit. The ECU then uses this information to adjust the air-to-fuel ratio in the combustion chamber to keep the Maxima at peak performance.

Instructions

Removal

1

Raise the front of the Maxima with a floor jack and slide jack stands under the vehicles subframe. Lower the Maxima onto the jack stands.

2

Crawl under the middle of the vehicle and find the front pipe, the exhaust pipe just before the catalytic converter. Find the oxygen sensor screwed into the front pipe, just before the catalytic converter.

3

Spray the base of the oxygen sensor with penetrating oil and allow it to sit for the time specified in the penetrating oil instructions.

4

Trace the oxygen sensors wiring upward until you find where the sensors wiring harness plugs into the Maximas wiring harness. Unplug the oxygen sensors wiring harness.

5

Remove the oxygen sensor from the front pipe, using a ratchet and oxygen sensor socket.

Installation

6

Apply a coating of anti-seize compound to the new oxygen sensors threads and hand-tighten the sensor into the front pipe.

7

Tighten the sensor to 15 foot-pounds using a torque wrench and oxygen sensor socket.

8

Apply a small amount of dielectric grease to the inside of the oxygen sensors wiring harness and plug the sensors harness into the Maximas wiring harness.

9

Raise the vehicle off the jack stands and remove the stands. Lower the vehicle to the ground.