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Q: 4 wheel drive doesnt work on 1990 Jeep Cherokee

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It always worked good before,one day just stopped(4-wheeldrive)
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It is possible that the Front axle shift motor actuator or associated vacuum hoses and / or switch may have a leak. Carefully inspect all vacuum hoses for splits, cracks and swelling. Replace if necessary. There are (5) components, !. Vacuum Control Switch, 2. Air Vent Filter, 3> Vacuum Shift Motor, 4. 4WD Indicator Light Vacuum Switch, 5. Vacuum Check Valve. plus vacuum harness and hoses.
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