2003 BUICK RENDEZVOUS

Typical onset: 60,000-100,000 mi

Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold start, Milky oil on dipstick or oil cap, Overheating, Rough idle and misfire codes

Fix: Upper and lower intake gaskets fail, allowing coolant into cylinders and oil passages. Requires complete intake removal, resurface if warped, replace gaskets and all coolant. Common to find cylinder wash and bearing damage if driven long after failure starts. 8-10 hours labor if caught early, 40+ hours if it grenaded the bottom end.

Estimated cost: $800-1,200 for gaskets alone, $3,500-5,500 if engine needs rebuild

Typical onset: 80,000-130,000 mi

Symptoms: Pink milkshake in coolant reservoir (transmission fluid mixing with coolant), Transmission slipping or no movement, Rust-through of metal cooler lines at frame brackets, Transmission overheating

Fix: The radiator's internal transmission cooler develops pinhole leaks, cross-contaminating coolant and ATF. If coolant enters transmission, it destroys clutches and requires full rebuild. External cooler lines rot at mounting points. Proper fix: replace radiator, flush both systems, add external cooler, replace all cooler lines. If trans got contaminated, add 12-16 hours for rebuild. This is the number one killer of the 4T65-E in these.

Estimated cost: $600-900 preventive (radiator and lines), $2,800-4,200 if transmission rebuild needed

Typical onset: 70,000-110,000 mi

Symptoms: Severe clunk when shifting from Park to Drive or Reverse, Vibration at idle in Drive, Visible engine/trans sag on passenger side, Difficulty shifting

Fix: The hydraulic transmission mount fails internally, allowing excessive powertrain movement. Causes harsh shifts and accelerated wear on axle boots and shift cables. Replace mount and typically the torque strut mount at the same time. 2.5-3 hours labor.

Estimated cost: $350-550

Typical onset: 90,000-140,000 mi

Symptoms: Slow coolant loss, Coolant smell in cabin, Small external leak at intake manifold valley, No mixing with oil like 3.4L

Fix: The 3.5L is far less catastrophic than the 3.4L but still develops lower intake gasket leaks. Usually external seepage rather than internal failure. Requires intake removal and gasket replacement. 6-7 hours labor.

Estimated cost: $650-950

Symptoms: Fuel smell, Visible rust on tank straps, Fuel gauge erratic, Check engine light with EVAP codes, Fuel leak when filling

Fix: Rust belt special: tank straps rot through and filler neck develops pinholes. NHTSA recall covered some tanks but not straps. Requires tank drop, strap replacement, sometimes new filler neck and hoses. 3-4 hours labor if just straps, 5-6 if neck and EVAP lines involved.

Estimated cost: $450-850

Typical onset: 100,000-150,000 mi

Symptoms: Power steering fluid leak near engine, Whining from pump, Heavy steering, Smoke from fluid hitting exhaust

Fix: High-pressure hose develops leaks where crimped to fittings, usually at pump end. Leaks onto exhaust creating smoke show. Replace hose, flush system, check pump for damage. 1.5-2 hours labor.

Estimated cost: $250-400

Typical onset: 80,000+ mi

Symptoms: Clunking from rear on turns (AWD models), Whining from transfer case, Fluid leak at rear of transmission, Binding during tight turns

Fix: AWD models have a transfer case bolted to the transaxle that almost nobody services. Fluid breaks down, seals leak, chain and bearings wear. Requires fluid service every 50k (almost never done). If damaged, requires case removal and rebuild or replacement. Fluid service is 1 hour, rebuild 8-10 hours.

Estimated cost: $120-180 for service, $1,800-2,800 for rebuild