2003 Mitsubishi Diamante
2003 Mitsubishi Diamante
Overview
The 2003 Mitsubishi Diamante, a mid-size sedan known for its comfortable ride and distinctive styling, offered a blend of performance and luxury for its era. While generally considered a reliable vehicle, like any car, it has specific areas that have seen more attention from owners regarding potential issues. This analysis focuses on documented technical reliability concerns beyond routine maintenance, providing insights into common problems reported by owners and mechanics. Understanding these potential weak points can help current and prospective owners make informed decisions about maintenance and repairs.
Engine
3.5L V6 (6G74)
Intake Manifold Gasket Leaks
- Symptoms: Coolant leaks, engine misfires, rough idle, overheating.
- Solution: Replacement of the intake manifold gaskets.
- Cost: $300 - $600
Timing Belt Failure
- Symptoms: Sudden engine shutdown, no start, potential catastrophic engine damage if not addressed promptly.
- Solution: Replacement of the timing belt, tensioners, and idler pulleys. Recommended at specified intervals.
- Cost: $600 - $1000
Transmission
4-Speed Automatic (F4A51)
Slipping Gears
- Symptoms: Delayed engagement, difficulty shifting, loss of power during acceleration.
- Solution: Transmission fluid and filter change, potential internal component repair or rebuild.
- Cost: $400 - $1500+
5-Speed Automatic (V5A51)
Harsh Shifting
- Symptoms: Jerking or clunking during gear changes, especially between 2nd and 3rd gear.
- Solution: Transmission fluid service, solenoid replacement, or transmission control module (TCM) recalibration.
- Cost: $300 - $800
Suspension
Standard Suspension
Worn Ball Joints and Bushings
- Symptoms: Clunking noises over bumps, uneven tire wear, vague steering feel.
- Solution: Replacement of worn ball joints and suspension bushings.
- Cost: $400 - $800
Electrical
General Electrical System
Power Window Motor Failure
- Symptoms: Windows not operating, slow movement, grinding noises.
- Solution: Replacement of the power window motor and regulator assembly.
- Cost: $200 - $400
Instrument Cluster Malfunctions
- Symptoms: Dim or non-functional gauges, warning lights staying on, flickering displays.
- Solution: Repair or replacement of the instrument cluster or associated components.
- Cost: $300 - $700
Exterior
Body and Trim
Clear Coat Peeling
- Symptoms: Paint fading, bubbling, or peeling, particularly on the roof and hood.
- Solution: Repainting affected areas or a full vehicle repaint.
- Cost: $500 - $2000+
Interior
Cabin Components
HVAC Blower Motor Failure
- Symptoms: No air coming from vents, or intermittent airflow, unusual noises from the dashboard.
- Solution: Replacement of the HVAC blower motor and resistor.
- Cost: $250 - $500
Summary Verdict
The 2003 Mitsubishi Diamante is a reasonably reliable vehicle, with most reported issues falling into categories like engine maintenance (timing belt, gaskets), transmission wear, and common electrical or exterior paint concerns. Proactive maintenance, especially regarding the timing belt and transmission fluid, is crucial for longevity. While some electrical and exterior issues can be costly, they are not indicative of systemic failure across the board. Overall, with diligent care and addressing specific known issues, the Diamante can provide dependable service.