The 1999 Jeep Cherokee remains a beloved icon in the SUV world, celebrated for its rugged capability and adventurous spirit. However, like any vehicle approaching a quarter-century of service, it presents a specific set of challenges owners should anticipate. Understanding the common problems with the 1999 Jeep Cherokee is essential for maintaining reliability and avoiding unexpected breakdowns. This guide delves into the most frequent issues reported by owners of this specific model year, providing insight into symptoms, causes, and potential solutions.
Electrical System Quirks and Component Failures
Electrical gremlins are perhaps the most pervasive category of issues found in the 1999 Cherokee. The wiring harnesses, particularly near the rear wheel wells, are susceptible to chafing and shorts, leading to intermittent failures. Owners often report sudden losses of power to accessories like power windows, seat motors, and dashboard lights. Furthermore, the vehicle's instrument cluster can develop backlighting problems or fail entirely, which not only hampers visibility but can also mask critical warning lights from other systems.
Sensor and Module Malfunctions
Beyond simple wiring, the Cherokee's engine management system relies on various sensors that can degrade over time. The crankshaft position sensor is a notorious culprit, and its failure can result in hard starting or the engine dying while driving. The Powertrain Control Module (PCM) itself, while generally robust, can experience issues that manifest as erratic shifting in the automatic transmission or a complete loss of engine power. Diagnosing these computer-related issues often requires specialized scan tools to retrieve fault codes.
Drivetrain and Transmission Concerns
Shifting into the mechanical heart of the vehicle, the 1999 Cherokee's transmission requires attention. The 42RE automatic transmission, while reliable, may begin to slip or delay engagement if the transmission fluid is not changed regularly with the correct type. Additionally, the transfer case, central to the Cherokee's part-time four-wheel-drive system, is vulnerable to fluid leaks. Leaks typically originate from the front seal or drain plug, and if left unaddressed, they can lead to insufficient lubrication, causing significant damage to gears and chains.
Front Suspension and Steering Wear
Drivers tackling rough terrain or simply enduring the rigors of daily commuting will eventually encounter suspension issues. The ball joints and tie rod ends on the short-arm/long-arm (SLA) front suspension are wear items that degrade with use. Worn components manifest as clunking noises over bumps, uneven tire wear, and vague steering feel. Proactively checking these components is crucial for both safety and handling integrity.
Cooling System Vulnerabilities
Thermal management is another area where the 1999 Cherokee demands vigilance. The aluminum intake manifold gasket is a known weak point on these engines; when it fails, it allows coolant to mix with the oil, creating a milky residue that is a sure sign of trouble. Simultaneously, the radiator itself can develop leaks, either through corrosion at the seams or from debris damage. Overheating is a common precursor to catastrophic engine failure, making regular inspection of hoses, the water pump, and the radiator cap critical.
Interior Upkeep and Material Fatigue
Time also takes its toll on the interior cabin. The plastic dashboards and door panels common in this era are prone to cracking and fading as the vehicle ages and is exposed to UV light. Squeaks and rattles often develop as interior trim fasteners loosen or the foam padding behind the dashboard deteriorates. While not mechanical, these issues significantly impact the perceived quality and comfort of the driving experience, making interior refurbishment a common project for dedicated owners.
