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the four wheel drive on this unit is vacuum assisted actuator located near the battery. It looks like a diaphragm with a cable thast goes to your front end to move the pickle sliding the axles in lock. The vacuum comes from the torque converter at a vacuum swicth locate don the right side of the torque converter with 3 lines coming from it. One of tyhese lines could have a hole or rotted losing vacuum. To see this you will need to remove the skid plates. If you find a bad line tie a string to the hoses and pull them thru, when you rep;lace the line, use the string to pull them back thru. Look at the plastic plug and notice the notch on it and compare to the notch on the vacuum switch. Vacuum switch is $39.00. Check to see if the actuator cable isn't frozen up or kinked, rusted. To do this push in on the diaprahm. Thge cable should move freely. Now can someone help me? Why wont my blazer make vacuum for the same reason?
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∙ 12y ago
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