1997 JEEP CHEROKEE

Typical onset: 120,000-180,000 mi

Symptoms: Persistent overheating despite new radiator and thermostat, White smoke from exhaust, coolant loss with no visible leaks, Rough idle when cold, smooths out when warm, Milky oil or coolant in overflow tank

Fix: The 0331 casting head (1999-2001 mainly, but some late '97s got them) cracks between cylinders 3-4. Requires head removal, inspection, possible replacement or repair with upgraded 7120 or Tupy casting. Figure 10-14 hours labor for R&R, resurfacing, new head gasket kit, and coolant flush.

Estimated cost: $1,800-3,200

Typical onset: 150,000-200,000 mi

Symptoms: Pink milkshake in radiator overflow (coolant/ATF mix), Transmission slipping, delayed engagement into gear, Overheating transmission, burnt ATF smell, Hard shifts or no 3rd/4th gear

Fix: Factory steel cooler lines rust through at radiator connection or the internal transmission cooler in radiator fails, cross-contaminating fluids. Must replace radiator, all cooler lines, flush entire system multiple times, often rebuild or replace transmission if contamination sat. External cooler upgrade recommended. 8-12 hours for lines/radiator, add 15-20 if trans needs rebuild.

Estimated cost: $800-1,200 (lines/radiator only), $2,500-4,000 (with transmission rebuild)

Symptoms: Fuel smell around vehicle, especially after filling, Sagging or visibly rusted tank straps, Fuel leaking near filler neck, check engine light for evap codes, Difficulty filling tank, pump clicks off repeatedly

Fix: Steel tank straps corrode and break, filler neck rusts at crimp joint. In rust belt states, this is nearly universal by now. Requires dropping tank (2-3 hours), replacing straps, often filler neck, and inspecting all fuel lines. Tank itself may need replacement if rusted through.

Estimated cost: $400-900

Typical onset: 80,000-150,000 mi

Symptoms: Violent steering wheel shake at 45-55 mph after hitting bump, Loose or wandering steering feel, Clunking from front end over bumps, Uneven tire wear on front axle

Fix: Combination of worn track bar bushings, ball joints, tie rod ends, and control arm bushings creates feedback loop oscillation. Start with track bar and drag link inspection. Typically need track bar, both tie rod ends, possibly ball joints and steering box adjustment. 4-8 hours depending on how many components need replacement.

Estimated cost: $600-1,500

Typical onset: 130,000-180,000 mi

Symptoms: Oil drips on driveway, visible wet spots on engine underside, Oil level drops 1 quart every 800-1,200 miles, Oil coating on bellhousing and transmission case, Burning oil smell after highway driving

Fix: 4.0L notorious for rear main seal weeping as engine ages. Oil pan gasket also leaks at corners. Rear main requires transmission removal (6-8 hours), oil pan can be done in-situ with motor mounts loosened and jack supporting engine (3-4 hours). Often done together to save labor.

Estimated cost: $500-900 (oil pan), $800-1,400 (rear main), $1,200-1,800 (both)

Typical onset: 100,000-160,000 mi

Symptoms: Intermittent stalling, no-start conditions, Check engine light with crank/cam position sensor codes, Rough running, misfires under load, Metal shavings in oil, ticking noise from front of engine

Fix: Plastic distributor gear strips teeth or bronze gear wears into camshaft. Requires distributor removal and replacement, often camshaft inspection or replacement if wear is severe. Can grenade and send debris through oil system. 3-5 hours for distributor, 8-12 if cam needs replacement.

Estimated cost: $400-700 (distributor only), $1,500-2,500 (with camshaft)

Symptoms: Check engine light with P0440, P0441, P0455 evap codes, Fuel smell near rear of vehicle when parked, Hissing sound when removing fuel cap, Failed emissions test

Fix: Evap canister, located ahead of fuel tank, cracks and saturates with fuel. Rubber lines dry-rot, leak detection pump fails. Often multiple components need replacement. Requires smoke test to pinpoint leaks. 2-4 hours for typical repair.

Estimated cost: $300-700