S15/T15 Sonoma P/U 2WD V6-4.3L VIN W (1996)
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Place the rotary knob in the malfunctioning position and check for vacuum at the pertinent vacuum actuator's.
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If vacuum exists at the actuator but the door does not move, then the actuator is defective or the door is mechanically bound.
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if low or no vacuum exists at the actuator, determine whether the cause is the vacuum harness or the vacuum valve.
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Check the vacuum harness first.
4. Vacuum harness circuit check:
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Disconnect the vacuum harness at the control head.
NOTE: The gray line should show engine vacuum. If not, trace back through the connector to the vacuum tank.
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To check any individual circuit, place the selector lever at the involved circuit position and check for vacuum.