The 1990 Dodge Colt was available in three different engines capacity, 1.5L 4G15 I4, 1.6L 4G61 I4 and 1.6L 4G61T I4. All models are equipped with 2 levels air conditioner system, ECONO position and A/C position. Below schematic depicts the 1990 Dodge Colt A/C Heater Wiring Diagram and System Circuit.