Notes: Engine Intake Manifold Heater Relay -- with skirt. 1991 Jeep Cherokee 2.5L 4 Cyl. 1991 Jeep Cherokee 4.0L 6 Cyl. 1988-1990 Jeep Cherokee. Built to Last: Our relays feature high-quality composite housings that protect against harsh temperatures and the most demanding under-hood conditions, ensuring lasting reliability.