The 1997 Legacy is a solid AWD platform, but the 2.5L engine is notorious for head gasket failures, while both engines can suffer from internal damage if overheated. Transmission cooler line corrosion and automatic transmission mount failures are widespread maintenance items.
Head Gasket Failure (2.5L Engine)
Common · high severityTypical onset: 80,000-120,000 mi
Symptoms: External coolant leaks at cylinder head mating surface, often visible as white crusty residue, Overheating, particularly on highway drives or hills, Coolant loss without visible puddles under vehicle, White smoke from exhaust or oil contamination in coolant (if internal failure progresses)
Fix: Replace both head gaskets, resurface heads if warped, replace timing components and water pump while apart. 12-16 labor hours at indie shop rates. Critical to catch early before overheating causes block or head damage.
Estimated cost: $1,800-2,800
Transmission Oil Cooler Line Corrosion
Common · high severityTypical onset: 100,000-150,000 mi
Symptoms: Transmission fluid leaking from front of vehicle near radiator, Red fluid puddles under car after sitting, Transmission overheating or slipping if fluid level drops significantly, Visible rust perforation on steel cooler lines running to radiator
Fix: Replace both transmission cooler lines from transmission to radiator. Lines rust through where they run along subframe and are exposed to road salt. 2-3 labor hours, straightforward job but requires lifting vehicle.
Estimated cost: $300-500
Automatic Transmission Mount Collapse
Common · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Clunking noise when shifting from Park to Drive or Reverse, Excessive vibration at idle, particularly when in gear, Visible transmission sag when inspected from below, Harsh engagement into gear
Fix: Replace rear transmission mount (crossmember mount). Rubber deteriorates and tears, allowing transmission to drop. 1.5-2 labor hours including subframe support.
Estimated cost: $200-350
Phase 1 2.2L Piston Ring Land Failure
Occasional · high severityTypical onset: 150,000-200,000 mi
Symptoms: Excessive blue smoke on startup and acceleration, High oil consumption (quart every 500-1000 miles), Loss of compression in one or more cylinders, Metallic rattling from engine if ring lands break and fragments circulate
Fix: Requires engine rebuild or short block replacement. Piston ring lands crack due to age and thermal cycling. Some mechanics opt for used JDM replacement engine. 18-24 labor hours for proper rebuild with machining.
Estimated cost: $3,000-5,000
Front Coil Spring Breakage
Occasional · medium severitySymptoms: Clunking noise over bumps from front suspension, Vehicle sits lower on one front corner, Popping sound when turning at full lock, Tire wear on inside edge if spring breaks and allows excessive camber
Fix: Replace broken coil spring, typically upper coil breaks due to corrosion in rust belt states. NHTSA recall covered some VINs but not all. Replace in pairs for even ride height. 2-3 labor hours per side with alignment.
Estimated cost: $400-700
Alternator Bearing and Regulator Failure
Occasional · medium severityTypical onset: 120,000-180,000 mi
Symptoms: Whining or grinding noise from accessory belt area, Battery warning light illuminated, Dimming headlights at idle, Electrical system voltage below 13.5V or above 15V
Fix: Replace alternator. Internal voltage regulator fails or bearings seize. Some units were recalled for brush wear. 1.5-2 labor hours, straightforward replacement.
Estimated cost: $350-550
Buy the 2.2L version if you can find one—it's bulletproof compared to the 2.5L, and at this age you're gambling on head gasket history either way.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.