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I believe the 1990 year still had the sealed system. So there is no rad cap. You can add fluid by pourig it into the overflow bottle with the vehicle running the coolant will be sucked into the system. No radiator cap exist in the 90, 91 model. You add the coolant to the coolant container (The coolant container cap is the equivalent of the radiator cap, (pressure device))and the palstic container is under pressure all the time. Be carefull when you want to open it after the car has been running. After those year models, Jeep discontinued the use of the pressure container and went back to tha radiator cap and remove the pressure coolant container.

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18y ago

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