2002 BUICK RENDEZVOUS

Typical onset: 60,000-100,000 mi

Symptoms: Coolant mixing with oil creating milkshake sludge, White exhaust smoke on startup, Overheating without external leaks, Rough idle and misfires, Coolant loss with no visible puddles

Fix: This is the Achilles heel of the 3400 V6. Plastic gasket deteriorates, allowing coolant into oil passages and cylinders. Requires intake manifold removal, gasket replacement, and thorough cleaning. If caught late, bearings are damaged requiring full engine rebuild. 6-8 hours labor for gasket only, 20-30 hours for rebuild.

Estimated cost: $800-1,200 gasket only, $3,500-5,500 if engine rebuild needed

Typical onset: 80,000-130,000 mi

Symptoms: Pink milky fluid in coolant overflow, Brown sludge in transmission fluid, Transmission slipping or delayed engagement, Overheating transmission, Coolant level dropping

Fix: Steel cooler lines rust through where they pass through radiator, allowing coolant and ATF to mix. Destroys transmission internally. Requires radiator replacement, new cooler lines, transmission flush or rebuild depending on contamination severity, and complete system flush. 8-12 hours for lines and flush, add 15-20 hours if transmission needs rebuild.

Estimated cost: $1,200-1,800 if caught early, $3,000-4,500 with transmission rebuild

Typical onset: 90,000-140,000 mi

Symptoms: External coolant leaks at head/block junction, Combustion gases in cooling system, Persistent overheating, White smoke from exhaust, Loss of coolant with no visible external leak

Fix: The 3.4L is more prone than 3.5L, often cascades from lower intake gasket neglect. Requires both heads pulled, resurfaced, new gaskets, and all intake/exhaust work. Smart to do timing components while in there. 12-16 hours labor.

Estimated cost: $2,200-3,500

Typical onset: 70,000-110,000 mi

Symptoms: Severe clunk when shifting from Park to Drive or Reverse, Vibration at idle in gear, Visible sagging of transmission, Harsh engagement

Fix: The rear transmission mount deteriorates, allowing excessive drivetrain movement. Easy diagnosis by visual inspection or having someone shift while you watch. 1.5-2 hours labor, straightforward replacement.

Estimated cost: $180-300

Typical onset: 80,000-120,000 mi

Symptoms: Check Engine Light with P1404 or P1406 codes, Poor acceleration at low RPM, Rough idle, Slight loss of fuel economy

Fix: Carbon buildup causes the intake manifold tuning valve to stick. Can sometimes be cleaned, but replacement is more reliable. 1.5-2.5 hours labor depending on which engine.

Estimated cost: $250-450

Typical onset: 100,000-150,000 mi

Symptoms: No start condition, Engine dying while driving, Whining noise from fuel tank, Hard starting when hot, Loss of power under load

Fix: The in-tank fuel pump assembly fails, typically the motor itself. Requires dropping the fuel tank or cutting access panel through floor. Most techs drop the tank. 2-3 hours labor.

Estimated cost: $450-700

Typical onset: 90,000-130,000 mi

Symptoms: Whining or groaning when turning, Fluid leaking from pump front seal, Stiff steering at low speeds, Power steering fluid reservoir constantly low

Fix: Front seal fails on pump, sometimes the pump body cracks. Replacement straightforward but requires belt and pulley work. Check rack and lines while you're in there. 2-3 hours labor.

Estimated cost: $350-550