2001 JEEP CHEROKEE

Typical onset: 80,000-150,000 mi

Symptoms: Transmission fluid leaking from radiator area or cooler lines, Pink milkshake fluid in radiator (cooler rupture allows trans fluid and coolant to mix), Sudden transmission slipping or failure after coolant contamination

Fix: Replace transmission oil cooler lines (prone to corrosion), flush transmission completely if contamination occurred, or full transmission rebuild if coolant got into valve body. Prevention: replace cooler lines proactively and add external cooler. 2-4 hours for lines, 12-18 hours for rebuild.

Estimated cost: $300-800 for lines and flush, $2,200-3,500 for rebuild if contaminated

Typical onset: 90,000-180,000 mi

Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold start, Overheating under load, Coolant in oil or oil in coolant (milky dipstick)

Fix: The infamous 0331 head (1999-2001) cracks between cylinders 3-4 due to casting flaw. Requires cylinder head replacement with updated 0630 or TUPY casting, machining, new head gasket, and bolts. Some shops warranty this fix. 10-14 hours labor.

Estimated cost: $1,800-2,800

Typical onset: 70,000-140,000 mi

Symptoms: Violent steering wheel oscillation at highway speeds, triggered by bumps, Wandering or loose steering feel, Clunking from front end over bumps

Fix: Caused by worn track bar bushings, tie rod ends, ball joints, or unit bearings compounding each other. Requires systematic replacement of worn steering/suspension components and proper alignment. Track bar and tie rods are most common culprits. 4-8 hours depending on extent.

Estimated cost: $600-1,500

Typical onset: 100,000-200,000 mi

Symptoms: Oil puddles under rear of engine, Oil coating transmission bellhousing, Oil drips from oil pan seam

Fix: The 4.0L weeps oil from rear main seal and oil pan gasket as it ages. Rear main requires transmission removal. Oil pan is easier but needs engine lift or crossmember drop for clearance. 3-4 hours for pan, 6-8 hours for rear main.

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

Symptoms: Visible rust perforation along rocker panels behind doors, Sagging rear hatch or misaligned doors, Soft or rusted floor pans, especially driver's side, Crusty rear lower quarter panels

Fix: The unibody structure rusts from the inside out in salt states. Rockers and rear quarters are structural — when compromised, frame stiffness is lost. Proper fix requires cutting out rust and welding in new metal. Undercoating only hides the problem. 10-30+ hours depending on severity.

Estimated cost: $1,500-5,000+ for welded repairs

Typical onset: 120,000-180,000 mi

Symptoms: No start or extended cranking when hot, Sputtering or loss of power under acceleration, Stalling at idle or when fuel level is low

Fix: In-tank pump fails from age and contamination. Requires tank drop and sender unit replacement. Use quality pump (Bosch or OEM) — cheap aftermarket units fail quickly. 2-3 hours labor.

Estimated cost: $400-700

Typical onset: 80,000-150,000 mi

Symptoms: Check Engine Light with P0455 or P0442 codes, Fuel smell near rear of vehicle, Difficulty filling gas tank (premature shutoff)

Fix: Cracked EVAP lines, leaking gas cap seal, or failed leak detection pump. Lines become brittle with age. Requires smoke test to pinpoint leak location. 1-3 hours depending on location.

Estimated cost: $150-500