2004 PONTIAC GRAND AM

Typical onset: 60,000-100,000 mi

Symptoms: Coolant loss with no visible leaks, White smoke from exhaust on startup, Milky oil on dipstick, Rough idle and misfires, Coolant smell in cabin

Fix: Replace lower intake manifold gaskets and upper plenum gaskets while it's apart. 6-8 hours labor. Often discover warped intake surfaces requiring machining. Strongly recommend pressure testing cooling system and replacing aging hoses during repair.

Estimated cost: $800-1,400

Typical onset: 80,000-140,000 mi

Symptoms: Harsh or delayed 1-2 shift, Slipping between gears, Check Engine light with P0758 or P1811 codes, Transmission stuck in 2nd or 3rd gear, Erratic shifting when cold

Fix: Replace pressure control solenoid and both shift solenoids, flush fluid, update valve body if worn. 4-6 hours labor. If delayed too long, internal clutch damage requires full rebuild at 12-16 hours labor.

Estimated cost: $600-1,200 for solenoids; $2,200-3,500 for rebuild

Symptoms: Security light flashing, no-start condition, Key won't turn in ignition, Car starts then dies after 2 seconds, Intermittent no-starts requiring 10-minute wait, Worn ignition cylinder with key stuck

Fix: Passlock sensor in lock cylinder fails or wiring breaks. Replace ignition lock cylinder assembly or perform Passlock relearn procedure (free but temporary). Some techs bypass system with resistor module. Cylinder replacement: 1.5 hours. This was subject to NHTSA recall for some VINs.

Estimated cost: $250-500 for cylinder replacement; $150-250 for bypass module

Typical onset: 70,000-110,000 mi

Symptoms: Clunking over bumps, Wandering steering or poor alignment retention, Inner tire edge wear, Steering wheel off-center after alignment, Looseness felt through steering wheel

Fix: Replace both lower control arms as assemblies (bushings not serviceable separately on most aftermarket parts). Ball joints integrated into arms. Alignment mandatory after replacement. 2.5-3 hours labor for both sides plus alignment.

Estimated cost: $450-750

Typical onset: 90,000-130,000 mi

Symptoms: Poor fuel economy suddenly, Black smoke from exhaust, Rough idle and hesitation, Gas smell from dipstick (leaking into oil), Hard starting when engine is hot

Fix: Pressure regulator diaphragm ruptures, dumping fuel into vacuum line and intake manifold. Replace regulator on fuel rail. 1.5 hours labor. Check for fuel contamination in oil; if present, change oil immediately after repair.

Estimated cost: $200-350

Typical onset: 80,000-120,000 mi

Symptoms: Overheating in traffic or at idle, Fans never turn on, Check Engine light with high coolant temp codes, AC blows warm at stops, Fans run constantly even when cold

Fix: Fan control module or relays fail, typically mounted near radiator and exposed to heat/moisture. Replace cooling fan control module and related relays. 1-1.5 hours labor. Verify wiring harness connections not corroded.

Estimated cost: $180-400

Typical onset: 60,000-100,000 mi

Symptoms: Window drops into door, Grinding or clicking noise when operating window, Window moves slowly or unevenly, Window won't go up or down, Window falls down when door closes

Fix: Plastic regulator gears strip or cables break. Replace complete window regulator assembly with motor. 1.5-2 hours labor per door. Driver door fails most frequently due to use.

Estimated cost: $250-450 per door