2000-2002 Daewoo Nubira Rack and Pinion: Diagnosing Leaks, Noises, and Stiff Steering

Symptoms of a Failing Daewoo Nubira Rack and Pinion

A failing rack and pinion will provide several distinct warnings. Because the Nubira uses a hydraulic system, many symptoms are related to fluid leaks and loss of pressure.

• Stiff or Heavy Steering: The most common sign is steering that feels unusually difficult, especially at slow speeds or when parking. This is often caused by a lack of hydraulic assist from an internal leak or a failing pump.
• "Morning Sickness": A classic symptom of internal seal wear is steering that is very stiff when the car is first started on a cool day but becomes easier as the engine warms up. This happens because cold, thick fluid bypasses the worn internal seals, but as the fluid warms and thins, it can build pressure more effectively.
• Leaking Power Steering Fluid: Puddles or drips of reddish or brown fluid under the front of the car are a clear sign of a leak. Check the bellows boots on either end of the rack; fluid leaking into these boots is a definitive sign the internal seals have failed.
• Grinding or Whining Noises: A grinding noise when turning the wheel can indicate metal-on-metal contact inside the rack due to a lack of lubrication. A whining noise that changes pitch as you turn the wheel is often related to the power steering pump starving for fluid, which can be caused by a leak in the rack.
• Clunking or Knocking Sounds: A clunking noise from the front end when you turn or go over bumps can be caused by worn inner tie rods (which are part of the rack assembly) or worn rack mounting bushings that allow the entire assembly to move.
• Loose Steering or Excessive Play: If the steering feels vague, sloppy, or you can move the steering wheel without the car changing direction, it points to wear in the internal gears of the rack or worn tie rods.

Buying a Used Rack and Pinion for Your 2000-2002 Nubira

Given the age of the Nubira and Daewoo's exit from the US market, finding a new OEM rack and pinion is highly unlikely. A quality, low-mileage used OEM unit is often a better choice than a new, cheaply made aftermarket part. Here’s what to inspect.

Physical Inspection Checklist:

• Check the Bellows Boots: The rubber boots on each end of the rack are critical. Squeeze them firmly. If you feel fluid inside or see any drips, the internal seals are bad and the rack should be rejected. The boots themselves should be free of rips or tears, as this allows dirt and water to enter and destroy the inner tie rods and seals.
• Inspect for External Leaks: Look closely at the areas where the fluid lines connect and around the input shaft seal (where the steering column attaches). While some light staining from disassembly is normal, avoid any rack that is caked in old, oily grime, as this indicates a long-term leak.
• Examine the Inner Tie Rods: The rack assembly includes the inner tie rods. Grab each one and try to move it in and out of the rack. There should be no clunking or excessive play. The ball-and-socket joints should move smoothly but with some resistance.
• Look at the Mounting Points: Ensure the mounting brackets and bolt holes are not damaged, cracked, or stripped.
• Assess Overall Condition: Avoid parts with heavy corrosion or signs of physical damage from an accident. A part from a lower-mileage vehicle is always preferable, as the hydraulic seals are the primary failure point and degrade with age and use.

Cost of Replacement: New, Used, and Remanufactured

Replacing a rack and pinion can be costly, with labor making up a significant portion of the bill. An alignment is mandatory after the job, adding to the total cost.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While the National Highway Traffic Safety Administration (NHTSA) has issued 3 recalls for the 2000-2002 Daewoo Nubira, none of them directly address the rack and pinion assembly. The recalls were for issues related to the front brake hoses and the camshaft position sensor. There are no widespread, documented patterns of premature rack and pinion failure unique to the Nubira; failures are typically due to normal age and wear.

Related Parts to Inspect and Replace

When replacing the rack and pinion, it's wise to inspect several related components. Accessing the rack is labor-intensive, so replacing these parts at the same time can save you money on future labor costs.

• Outer Tie Rod Ends: These connect the rack and pinion assembly to the steering knuckles. They wear out and are almost always recommended for replacement with the rack.
• Power Steering Hoses: Inspect the high-pressure and return lines for cracks, brittleness, or leaks. Replace them now if they are in poor condition.
• Power Steering Pump: If the old rack failed catastrophically and sent metal debris through the system, the pump may have been damaged. Check it for leaks or noisy operation.
• Power Steering Fluid: Always flush the system and use fresh, new fluid. Old, contaminated fluid will quickly ruin a new rack.

Installation Tips and Special Procedures

Replacing the rack and pinion on a front-wheel-drive car like the Nubira can be challenging due to tight access. While specific torque specs for the Nubira are not readily available, general specifications for this type of repair can be used as a guideline. Always consult a proper service manual for exact figures.

• System Flush: It is critical to flush the power steering system to remove any metal particles or contaminated fluid from the pump and lines before connecting the new rack. Failure to do so can cause the replacement part to fail immediately.
• Fluid Type: Use a quality, standard power steering fluid. Some universal fluids or ATF (Automatic Transmission Fluid) like Dexron/Mercon types may be compatible, but a fluid specifically designated for power steering systems is the safest choice.
• Torque Specs: As a general guide, rack mounting bolts are often torqued to 60-85 ft-lbs, and tie rod end nuts to 35-50 ft-lbs. These are not vehicle-specific numbers; verify with a service manual.
• Bleeding the System: After installation and refilling the fluid, you must bleed the air out of the system. With the front wheels off the ground, turn the steering wheel slowly from lock to lock several times with the engine off, then repeat with the engine on. Check and top off the fluid level as the air escapes.
• Wheel Alignment: A full four-wheel alignment is not optional. It is a required final step to prevent unsafe handling and rapid tire wear.

Frequently Asked Questions (FAQ)