Upgrading Factory Cooling System on Jeep Cherokee XJ 4.0L tresseslength.com

One of the most overlooked, yet critically important, aspects of upgrading your XJ’s cooling system is the relationship between engine heat and your headlights. The Jeep Cherokee XJ headlight switch and wiring harness are notoriously undersized, and excessive heat under the hood—exactly what you are fighting with cooling upgrades—can accelerate the degradation of these components . Owners have reported headlight switches overheating to the point of melting the wiring harness, with one forum member discovering his connector had nearly caught fire . The root cause is high resistance in the circuit, which generates heat, and an already-hot engine bay only makes matters worse.