1998 JEEP CHEROKEE

Typical onset: 80,000-150,000 mi

Symptoms: coolant loss with no visible leaks, overheating under load, white smoke from exhaust on cold start, milky oil or coolant mixing

Fix: The 0331 casting head (1999-2001 mostly, but some late '98s) cracks between cylinders 3 and 4. Requires head removal, replacement with updated Tupy casting or older 0630 head, machining, and new gaskets. 12-16 labor hours, often includes timing chain and water pump while apart.

Estimated cost: $1,800-3,200

Typical onset: 100,000-180,000 mi

Symptoms: harsh or delayed shifts when hot, burnt transmission fluid smell, slipping between gears, complete loss of forward gears

Fix: Factory transmission cooler is inadequate, especially with heavy loads or towing. Cooler lines corrode and leak. Overheating destroys clutch packs and seals. Fix involves external auxiliary cooler install (2-3 hours), fluid flush, or full rebuild if damaged. Rebuild is 8-12 hours plus parts.

Estimated cost: $300-800 for cooler upgrade; $1,800-3,000 for rebuild

Typical onset: 60,000-120,000 mi

Symptoms: violent shaking of entire vehicle over bumps at 45+ mph, loose or vague steering, clunking from front end over bumps

Fix: Caused by worn track bar bushings, tie rod ends, ball joints, or steering box. Requires systematic inspection and replacement of worn components. Track bar and tie rods are most common culprits. Labor is 3-6 hours depending on how many parts need replacement. Alignment required after.

Estimated cost: $400-1,200

Symptoms: rust bubbling at bottom of tailgate and rear quarter panels, rust perforation around rear window frame, liftgate difficult to open due to corrosion

Fix: XJs rust badly in the rear, especially lower tailgate seams and quarter panels. Minor surface rust can be wire-brushed and treated, but perforation requires panel replacement or patch welding. Cosmetic issue mostly unless structural rot spreads to frame.

Estimated cost: $200-600 for rust repair; $800-1,500 for panel replacement

Typical onset: 100,000-160,000 mi

Symptoms: no start or intermittent stalling, fuel gauge reading empty when tank is full or erratic, whining noise from rear of vehicle

Fix: In-tank fuel pump fails, often with sending unit. Requires dropping the 20-gallon fuel tank (easier with less fuel), replacing pump module assembly. 2-3 hours labor. OEM-quality parts critical to avoid repeat failures.

Estimated cost: $400-700

Typical onset: 70,000-140,000 mi

Symptoms: intermittent no-start, especially when hot, stalling while driving with no warning, cranks but won't fire

Fix: The CPS on the 4.0L bellhousing fails due to heat. When it dies, the engine won't start or suddenly cuts out. Sensor itself is $30-80, but access requires removing the bellhousing inspection cover or going in from underneath. 1-2 hours labor. Carry a spare if wheeling remote areas.

Estimated cost: $150-300

Typical onset: 120,000-180,000 mi

Symptoms: no heat or only cold air from vents, sweet coolant smell inside cabin, fogged windows and wet passenger floor, clicking noise from dash when adjusting temperature

Fix: Plastic blend door breaks inside HVAC box, or heater core leaks. Blend door is accessible with partial dash removal (6-8 hours). Full heater core replacement requires complete dash removal (10-14 hours), steering column drop, and evaporator case disassembly. Brutal job on XJs.

Estimated cost: $400-800 for blend door; $800-1,400 for heater core