2004 Chevrolet Impala
2004 Chevrolet Impala
Overview
The 2004 Chevrolet Impala, a popular mid-size sedan, offered a range of powertrain options and a comfortable ride. While generally considered a reliable vehicle for its era, certain model years and specific configurations experienced some recurring issues. This analysis focuses on documented technical reliability concerns, excluding routine maintenance and normal wear and tear, to provide a clear picture for potential owners or those maintaining the vehicle. Understanding these potential problem areas can help in proactive maintenance and informed purchasing decisions.
Engine
3.4L V6 (LA1)
Intake Manifold Gasket Leaks
- Symptoms: Coolant leaks, engine overheating, sweet smell from coolant.
- Solution: Replacement of intake manifold gaskets.
- Cost: $300 - $600
Oil Cooler Line Leaks
- Symptoms: Oil leaks under the vehicle, low oil pressure warning.
- Solution: Replacement of oil cooler lines.
- Cost: $250 - $500
3.8L V6 (L36)
Intake Manifold Gasket Leaks
- Symptoms: Coolant leaks, engine overheating, sweet smell from coolant.
- Solution: Replacement of intake manifold gaskets.
- Cost: $300 - $600
Head Gasket Failures
- Symptoms: Coolant in oil, white smoke from exhaust, engine misfires, overheating.
- Solution: Replacement of head gaskets.
- Cost: $1000 - $2000
3.8L V6 Supercharged (L67)
Supercharger Belt Slippage
- Symptoms: Loss of power, whining noise from engine bay.
- Solution: Replacement of supercharger belt and tensioner.
- Cost: $150 - $300
Intake Manifold Gasket Leaks
- Symptoms: Coolant leaks, engine overheating, sweet smell from coolant.
- Solution: Replacement of intake manifold gaskets.
- Cost: $300 - $600
Transmission
4T65-E Automatic
Torque Converter Issues
- Symptoms: Shuddering, slipping, delayed engagement, transmission fluid leaks.
- Solution: Rebuild or replacement of torque converter.
- Cost: $700 - $1500
Solenoid Malfunctions
- Symptoms: Harsh shifting, failure to shift gears, transmission warning light.
- Solution: Replacement of transmission solenoids.
- Cost: $400 - $800
Suspension
Standard Chassis
Strut Mount Bearing Failure
- Symptoms: Clunking or popping noise when turning the steering wheel, especially at low speeds.
- Solution: Replacement of strut mount bearings.
- Cost: $200 - $400
Worn Ball Joints
- Symptoms: Clunking or rattling noises from the front suspension, uneven tire wear, steering wander.
- Solution: Replacement of ball joints.
- Cost: $300 - $600
Electrical
Body Control Module (BCM)
BCM Malfunctions
- Symptoms: Intermittent electrical issues, power window problems, interior light malfunctions, door lock issues.
- Solution: Reprogramming or replacement of the BCM.
- Cost: $500 - $1000
Alternator
Alternator Failure
- Symptoms: Dimming headlights, battery warning light, electrical system failures, dead battery.
- Solution: Replacement of the alternator.
- Cost: $400 - $700
Exterior
Body Panels
Rust on Quarter Panels
- Symptoms: Visible rust or bubbling paint, particularly around the rear wheel wells.
- Solution: Rust repair and repainting.
- Cost: $300 - $800 per panel
Headlight Lenses
Clouding/Yellowing
- Symptoms: Reduced headlight visibility, hazy or yellowed plastic lenses.
- Solution: Headlight restoration kit or replacement of headlight assemblies.
- Cost: $100 - $300
Interior
HVAC System
Blend Door Actuator Failure
- Symptoms: Inability to control temperature or direct airflow (e.g., only hot air, air only from defroster).
- Solution: Replacement of the blend door actuator.
- Cost: $200 - $400
Seat Fabric
Excessive Wear
- Symptoms: Tearing or thinning of fabric on driver’s seat bolsters and cushion.
- Solution: Seat cover replacement or professional upholstery repair.
- Cost: $150 - $500
Summary Verdict
The 2004 Chevrolet Impala, particularly models equipped with the 3.8L V6 engines, can be prone to intake manifold gasket leaks and, in some cases, head gasket issues. Transmission problems, specifically with the 4T65-E, often involve the torque converter or solenoids. Electrical gremlins related to the BCM and alternator failures are also noted. While exterior rust can be a concern in certain climates, and interior wear is typical for its age, these are the most commonly reported technical reliability concerns. Overall, with diligent maintenance and awareness of these potential issues, the 2004 Impala can remain a functional vehicle.