1971–1976 BUICK LESABRE

Typical onset: original radiators typically fail 60,000-100,000 mi, but many are now 50+ years old

Symptoms: Pink or red ATF in coolant overflow, Transmission overheating or slipping after warmup, Milky transmission fluid (coolant contamination), Cooler line leaks at crimped fittings near radiator

Fix: Replace radiator with correct lower cooler provision, flush transmission thoroughly if contaminated (4-6 hours labor), pan drop and filter change minimum. Contaminated fluid often requires full rebuild within 5,000 miles.

Estimated cost: $600-1,200 for radiator and lines; $1,800-3,000 if transmission rebuild needed

Typical onset: 80,000+ mi, but often age-related on low-mileage survivors

Symptoms: Oil drips from bellhousing area or rear of oil pan, Oil spots on driveway after sitting, Visible oil coating on transmission case, Low oil level between changes

Fix: Rear main seal requires transmission removal (8-10 hours labor). Oil pan can be dropped with engine in car but requires lifting motor mounts and exhaust work (4-5 hours). Often done together since access overlaps.

Estimated cost: $800-1,400 for rear main; $400-700 for oil pan; $1,200-1,800 both

Symptoms: Hard cold starts, needs excessive cranking, Stalling when coming to stops, Rough idle that smooths out above 1,500 RPM, Fuel smell and visible weeping around throttle shaft bushings, Poor fuel economy (under 10 MPG city)

Fix: Original Rochester 2GC/2GV carbs have worn throttle shafts causing vacuum leaks, degraded accelerator pump diaphragms, and varnished internals from ethanol. Proper rebuild with bushing replacement takes 3-4 hours; many shops now recommend Edelbrock 1406 swap (2 hours) for reliability.

Estimated cost: $350-600 rebuild; $500-700 with Edelbrock replacement

Symptoms: Visible rust-through on frame rails behind front wheels and ahead of rear axle, Body sag or misalignment, doors not closing properly, Cracking windshield without impact (body flex), Clunking over bumps from collapsed body bushings

Fix: Northern/rust-belt cars commonly have compromised frame integrity. Body mounts are replaceable (6-8 hours for all mounts), but frame rust often requires professional welding of boxed sections (20+ hours) or disqualifies the car from safe use. Inspect thoroughly before purchase.

Estimated cost: $800-1,200 body mounts only; $3,000-6,000+ frame repair if repairable

Typical onset: 100,000+ mi or age-related

Symptoms: Coolant loss with no visible external leaks, White smoke from tailpipe on cold start, Rough idle with occasional misfire, Oil contamination in coolant (less common, usually front china wall), External coolant seepage at intake valley

Fix: The 350 Buick uses a valley-style intake covering lifter valley. Requires removal of carburetor, distributor, and all accessories (6-8 hours). Use Felpro 1205 or equivalent with proper torque sequence. Often find warped intake requiring milling.

Estimated cost: $700-1,200

Symptoms: Whining when turning, especially when cold, Steering effort increases gradually over weeks, Fluid drips from pump mounting area or gearbox, Burning smell from fluid dripping on exhaust

Fix: Pump shaft seals and pressure hose connections deteriorate from heat cycles. Pump rebuild or replacement takes 2-3 hours; gearbox seals require 4-5 hours and alignment check. High-mileage boxes develop internal wear causing wandering, requiring replacement (not rebuildable by most shops).

Estimated cost: $300-500 pump; $600-900 steering gearbox

Symptoms: Fuel gauge erratic or non-functional, Fuel smell near tank or along frame rails, Rust particles in fuel filter (replace frequently), Hard starting after sitting, runs fine after restart, Visible rust on steel fuel lines along frame

Fix: 50-year-old steel tanks and lines are time bombs. Tank removal reveals internal rust; sending units fail from corroded wiring. Full system replacement (tank, sending unit, rubber hoses, filter) takes 6-8 hours. Steel line replacement adds significant time if rusted.

Estimated cost: $600-1,000 tank/sending unit; $1,200-2,000 with full line replacement