1998 LAND ROVER RANGE ROVER

Typical onset: 80,000-140,000 mi

Symptoms: Coolant loss with no external leaks visible, White smoke from exhaust on cold starts, Overheating despite new thermostat and water pump, Coolant contamination in oil (milky dipstick), Rough idle and misfires that progressively worsen

Fix: The Buick-derived 4.0L V8 has thin-wall aluminum block with pressed-in steel liners that shift downward over time due to thermal cycling. Once slipped, coolant enters cylinders and you'll need a complete engine rebuild with upgraded top-hat liners (block must be machined) or a replacement short block. Labor is 18-25 hours for removal, rebuild, and reinstall. Many owners opt for used engines, but those are gambles unless verified sleeved.

Estimated cost: $4,500-8,500

Typical onset: 60,000-120,000 mi

Symptoms: Vehicle sags to bump stops overnight or after sitting, Compressor runs constantly (audible under right rear), Suspension warning light on dash, Uneven ride height side-to-side, Compressor thermal shutdown in hot weather

Fix: The EAS (Electronic Air Suspension) compressor and valve block both fail regularly. Compressor wears out from constant cycling due to air leaks in the system. Valve block diaphragms tear internally. Compressor replacement is 2-3 hours, valve block rebuild is 3-4 hours. Many owners convert to Arnott or Dunlop aftermarket kits, or go full coil-spring conversion (4-6 hours labor) to eliminate the system entirely.

Estimated cost: $800-2,200

Typical onset: 70,000-110,000 mi

Symptoms: External coolant leaks at block/head junction, Overheating under load or highway driving, Pressure building in cooling system (hard upper hose), Bubbles in coolant reservoir when running, Combustion gases in coolant (positive block test)

Fix: Head gaskets fail due to inadequate clamping force and thermal stress on the thin-wall block. Once one side goes, the other typically follows within 10,000 miles. Requires both heads removed, resurfaced, new gaskets, and ARP studs recommended over OE bolts. Labor is 14-18 hours for both sides with studs. If caught early before liner movement, you can avoid full block work. Always pressure-test block for liner integrity before reassembly.

Estimated cost: $2,800-4,500

Typical onset: null

Symptoms: Transmission fluid dripping from front-center undercarriage, Delayed shifts or slipping when cold, Overheating transmission (burnt smell), Pink milkshake in coolant reservoir (cooler internal leak)

Fix: The ZF 4HP22/24 transmission cooler lines corrode and burst, especially the crimped fittings. The cooler itself can fail internally, mixing ATF and coolant which destroys the transmission. External leaks are 1-2 hours to replace lines. Internal cooler failure means full transmission flush, cooler replacement, and often transmission rebuild if contamination occurred. Replace all hard lines and cooler as preventive maintenance past 100k miles.

Estimated cost: $400-3,500

Typical onset: null

Symptoms: Battery dies after 2-3 days of sitting, Door locks cycle randomly or don't respond to fob, Windows drop slightly and won't close properly, Immobilizer prevents starting intermittently, Dash warning lights flicker or stay illuminated

Fix: The BECM has poor capacitor design and the RF receiver (for keyless entry) stays awake constantly from stray RF interference, draining battery. Common fix is installing a relay to cut power to RF receiver when ignition off (1 hour DIY). BECM itself can be rebuilt by specialists (send-out service) or replaced with used unit that requires programming. Battery drain diagnosis is 1-2 hours; BECM R&R is 2-3 hours.

Estimated cost: $150-1,200

Typical onset: 15+ years age-related

Symptoms: Sweet coolant smell in cabin with heat on, Coolant puddle under dash (passenger side carpet soaked), Steam from defrost vents, Sudden coolant loss with no underbody drips, Burst lower radiator hose or water pump inlet hose

Fix: All rubber coolant hoses become brittle and fail catastrophically on these engines. The heater core inlet hoses at the firewall are particularly prone to bursting, flooding the interior and sometimes shorting the BECM located under passenger seat. Heater core replacement requires full dash removal (10-14 hours). Preventive replacement of all coolant hoses is 3-4 hours and cheap insurance. This is the subject of NHTSA recalls for hose failures.

Estimated cost: $300-2,500