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1999 Kia Sportage 4WD Drivetrain-mode failed

CONDITION 4 wheel drive mode failure (diagnosed during or after replacing the knuckles and hub seals) due to inadequate vacuum is applied to the hubs. In some cases cause moisture the vacuum system and vacuum lines are corroded, connected, or have developed a leak. CORRECTIVE action verify that with 4 wheel drive mode selected, vacuum is present on the T-piece downstream of the solenoid (see photo). If not, diagnose and repair as required, use the following procedure otherwise replacing the vacuum lines: Note: Procedure is applicable to the right side line; left should no further info. Disconnect and remove the battery and the battery tray. Leaving ground cables connected, clamp bracket removing battery tray down and move out of the way. Remove plastic air resonator and disconnect throttle cable (plus a/T control cable if equipped).  Download