SOURCE: 4wd not engaging
Is it a two wire actuator or a three wire actuator? The two wire ones are pretty unreliable. that is why Chevrolet converter them to the three wire. Check for power and ground on the two wire in 4wd. For the three is should have one ground wire, one wire that is hot in 4wd, and one wire that is hot in 2wd.
SOURCE: need help changing the front rotors on my chevy
Have to pull the front wheels, next back out the two caliper bolts (Allen head), next slide the caliper out of it's seat and set up on the spindle, careful not to damage the flex brake line. This will now free the rotor to come off the spindle. This is also a good time to check/replace brake pads. Chances are if your changing rotors, due to brake damage, warped or other, the pads need changed. This is simply done by sliding the old pads out and placing a C clamp over the piston to back it into the caliper housing to allow room to install new pads. Apply a little antisieze lub behind the pad between the piston and also anywhere the new pad bears. Install the caliper in reverse order and put the wheels back on. Remember to test the brakes before hitting the road, The new pads will have to be pushed out by applying brakes a few times. Then you should be good to go.
Hope this helps.
SOURCE: 4x4 not working 0n 91 chevy pickup k 1500
The actuator can be tested with hand vacuum tester. I don't believe it will work without the actuator.
SOURCE: 4/04 ford f150 4x4 front axle actuator won' t stay disengaged
Even though you checked the vacuum lines and found no leaks it does not mean there isn't a problem. The check valve in the line closest to the firewall actuator is probably your problem. Had the same issue replaced this line and solved it. The check valves in the vacuum lines are your best next guess.
SOURCE: 1990 Chevy 1500 4x4 won't engage 4 wheel drive
the 4x4 do not engage in my1990 chevy pick up what i need to check
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