2004 Pontiac Montana

The 2004 Pontiac Montana is a minivan known for its versatility and spacious interior, offering seating for up to seven passengers. It was available with a 3.4L LA1 V6 engine producing 185 horsepower and 210 lb-ft of torque, paired with a 4T65-E four-speed automatic transmission. Owners appreciate its comfortable ride and ample cargo space, but some common complaints include electrical issues, specifically with the power sliding doors, and problems with the cooling system.

Engine

3.4L LA1 V6

• Intake Manifold Gasket Failure
  • Description/Symptoms: Coolant leak, overheating, milky oil, and engine misfires. The leak often occurs at the lower intake manifold gasket.
  • Solution: Replace the intake manifold gaskets with updated versions.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Low coolant level, overheating, and visible leaks around the engine.
  • Solution: Inspect and replace the water pump, radiator hoses, thermostat housing, and radiator.
  • Estimated Cost to Fix: $100 - $600+ depending on the component

Transmission

4T65-E Four-Speed Automatic

• Shift Problems/Slipping
  • Description/Symptoms: Harsh or delayed shifting, slipping between gears, and difficulty engaging in certain gears. This can be caused by worn clutch packs, valve body issues, or solenoid failures.
  • Solution: Transmission rebuild or replacement, valve body repair/replacement, or solenoid replacement.
  • Estimated Cost to Fix: $200 - $3000+ depending on the extent of the damage and solution.
  • Recalls: None Found

Suspension

• Worn Struts/Shocks
  • Description/Symptoms: Bouncy ride, poor handling, excessive body roll, and uneven tire wear.
  • Solution: Replace worn struts and shocks.
  • Estimated Cost to Fix: $300 - $800+ per axle
  • Recalls: None Found
• Worn Stabilizer Bar Links
  • Description/Symptoms: Clunking noises when driving over bumps, especially at lower speeds.
  • Solution: Replace the stabilizer bar links.
  • Estimated Cost to Fix: $100 - $300+ per pair
  • Recalls: None Found

Electrical

• Power Sliding Door Issues
  • Description/Symptoms: Intermittent operation, failure to open or close, or unusual noises when operating the power sliding doors. Often caused by a faulty motor, worn rollers, or damaged wiring.
  • Solution: Diagnose and repair or replace the motor, rollers, or wiring.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found
• Instrument Cluster Problems
  • Description/Symptoms: Gauges not working properly, dim or flickering display, or complete failure of the instrument cluster.
  • Solution: Repair or replace the instrument cluster.
  • Estimated Cost to Fix: $150 - $500+
  • Recalls: None Found

Exterior

• Power Door Lock Failure
  • Description/Symptoms: One or more of the power door locks will stop functioning. Either the lock will no longer function via remote, dash switch, or manual switch, or it will erratically engage and disengage.
  • Solution: Replace the affected door lock actuator
  • Estimated Cost to Fix: $150 - $300+
  • Recalls: None Found

Interior

• Headliner Sagging
  • Description/Symptoms: The headliner fabric detaches from the backing and starts to sag. This is often caused by age and heat exposure.
  • Solution: Replace or re-glue the headliner.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Summary

The 2004 Pontiac Montana can be a reliable minivan, but owners should be aware of potential issues, particularly with the engine, transmission, and electrical systems. Intake manifold gasket leaks and cooling system problems can lead to overheating and engine damage, while transmission issues can result in costly repairs or replacements. Electrical problems with the power sliding doors and instrument cluster are also common. Overall, the severity and cost of repairs can range from minor fixes to major overhauls, so prospective buyers should thoroughly inspect the vehicle and address any known issues before purchasing.