1990 PLYMOUTH GRAND VOYAGER

Typical onset: 80,000-150,000 mi

Symptoms: Harsh or delayed 2-3 upshift, slipping in overdrive, Shuddering on acceleration from stop, No movement in any gear after warm-up, Transmission 'limp mode' with check engine light

Fix: The 4-speed electronically-controlled A604 is notoriously fragile with solenoid pack and clutch failures. Rebuild requires 12-16 hours; used transmissions often fail quickly. External oil cooler replacement almost always needed simultaneously due to internal debris contamination. Proper diagnosis requires scan tool to read transmission codes.

Estimated cost: $2,200-3,800

Typical onset: 100,000-180,000 mi

Symptoms: Overheating with no external coolant leaks, White smoke from exhaust, sweet smell, Milky oil on dipstick or cap, Coolant loss with no visible puddles, Bubbling in coolant reservoir when running

Fix: The 3.3L develops head gasket leaks and often cracks between cylinders 3-4. Head gasket job alone is 14-18 hours due to tight engine bay, but block cracks require short block replacement (20-26 hours). Always pressure-test block before committing to head gasket work. Many techs prefer used engine swaps at this mileage.

Estimated cost: $1,800-4,500

Typical onset: 60,000-120,000 mi

Symptoms: Red ATF puddles under engine bay or near radiator, Low transmission fluid warnings or slipping, Visible corrosion on steel cooler lines along frame rail, Transmission overheating after highway driving

Fix: Steel cooler lines rust through at frame contact points and crimp fittings. Lines run entire length of van, requiring 3-5 hours to replace both. Must drop crossmember for access. OE-style replacement lines also rust; some techs fabricate stainless or use transmission cooler hose with proper fittings. Always replace both lines simultaneously.

Estimated cost: $350-650

Typical onset: 70,000-130,000 mi

Symptoms: Severe clunk when shifting from park to drive/reverse, Engine rocks excessively during acceleration, Vibration at idle that disappears when in neutral, Visible separation or fluid leaking from hydraulic mount

Fix: Front and rear engine mounts collapse from transverse V6 torque. Right-side transmission mount is hydraulic and fails most frequently (2.5 hours). Engine mounts require supporting powertrain with jack—front mount is 3 hours, rear is 4 hours due to access. Replace all three simultaneously to avoid repeat labor charges.

Estimated cost: $450-850

Symptoms: Liftgate won't stay open, falls on head, Latch won't catch, requiring slamming, Power lock actuator buzzing but latch not engaging, Liftgate opens partially then stops

Fix: Gas struts weaken over time (0.5 hours for both). Latch mechanism plastic gears strip and require complete assembly replacement (1.5 hours). Recall addressed some latch failures but not all production units. Aftermarket struts available cheap but measure compressed/extended length carefully.

Estimated cost: $180-400

Typical onset: 80,000-140,000 mi

Symptoms: Clunking over bumps from front end, Wandering or loose steering feel, Tire wear on inside edge, Visible play when prying on tire at 6-and-12 position

Fix: Non-serviceable pressed-in lower ball joints fail from minivan weight and pothole impacts. Requires control arm replacement or press work (2.5-3 hours per side). Always replace both sides and get 4-wheel alignment afterward. Failure can separate suddenly causing loss of control—this is a don't-delay repair.

Estimated cost: $450-750

Typical onset: 90,000-160,000 mi

Symptoms: No-start with cranking but no fuel pressure, Stalling when fuel tank below 1/4 tank, Fuel gauge reads empty when tank is full, or vice-versa, Whining noise from rear when key turned to 'on'

Fix: In-tank pump accessed through rear cargo floor (requires removing seats and cutting access panel or dropping 20-gallon tank—2.5-4 hours). Sending unit floats corrode. Replace pump and sending unit assembly together. Test fuel pressure at rail before condemning pump—could be clogged filter in tank sock.

Estimated cost: $350-650