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How does the vacuum switch work on a GMC Sonoma?

How does the vacuum switch work on a GMC Sonoma?

The actuator gets its vacuum when the transfer case shifts to 4WD. Shift forks, or whatever they call this apparatus inside the transfer case, push up against a spring-loaded ball that is part of the transfer case vacuum switch. At left is the push-button 4WD from my 1996 GMC Sonoma. This was an

How are the front wheels joined together on a GMC Sonoma?

The second action that has to take place is the front wheel axles must be joined together inside the differential housing. This gets the front wheels turning by way of the front drive shaft. The best I understand it, a collar must slide across the two axle shafts and join them up.

How does a GMC Sonoma transfer case work?

The transfer case can do its thing, but if the cable doesn’t pull the collar, 4WD is just a pipe dream. That cable is pulled by a pneumatic actuator under the battery tray. The actuator gets its vacuum when the transfer case shifts to 4WD. Shift forks, or switch. At left is the push-button 4WD from my 1996 GMC Sonoma. This was an

What kind of transmission does a GMC Sonoma have?

At left is the push-button 4WD from my 1996 GMC Sonoma. This was an option; standard 4WD trucks came with a manual shifter on the floor, as pictured on the right. First off, a disclaimer: I am not a mechanic.

How does a Sonoma transfer case switch work?

The vacuum sits on top of the transfer case. Seals inside the switch keep the fluid inside the transfer case out of the vacuum lines. However, it’s possible for the transfer case to “over-fill” itself with fluid. How? The junction of the transfer case and the transmission is into the transfer case. These seals can fail over time. When that

Where is the CD player switch on a Sonoma?

The switch is located on the top of the transfer case, which is directly underneath the cab. When the vacuum switch when separated from the switch. and Dolby noise reduction!). I was too cheap to add the CD player option when I ordered my Sonoma (what can I say, I was young). The HVAC controls are selector will eventually stop working correctly.

The second action that has to take place is the front wheel axles must be joined together inside the differential housing. This gets the front wheels turning by way of the front drive shaft. The best I understand it, a collar must slide across the two axle shafts and join them up.

What is the actuator on a 4 wheel drive?

The actuator is a component found mostly on modern four wheel drives and is designed to electronically engage 4 wheel drive. It accomplishes this by means of a small electric motor bolted onto the transfer case that shifts a pin in place to lock the center transfer differential.

When to replace the vacuum actuator on a blazer?

The vacuum lines should be completely flushed on this vehicle and there is likely a bad seal between the transmission and the transfer case. The vacuum actuator may need to be replaced in the future also due to the amount of transmission fluid in the actuator itself.

What does the blinking 4 wheel drive indicator mean?

So what is that 4 wheel drive indicator blinking on your dashboard means? The purpose of the 4 wheel drive light is to indicate when you have engaged 4WD mode by selecting 4H. When the light flashes continuously for more than 30 seconds it signifies there is a problem somewhere on your drivetrain system and that 4WD has not engaged properly.

How do you put a GM transfer case in neutral?

SOME KNOBS MAY LOOK DIFFERENT (TRAILBLAZER, ENVOY, etc..) BUT THE PROCEDURE IS THE SAME. First, make sure you are in 2 wheel drive position on the transfer case. Next, put your foot on the brake pedal and shift your transmission in Neutral. Rotate the dial all the way clockwise, PAST the 4LO position and HOLD IT THERE for approx. 10 seconds.

Where is the vacuum switch on a GMC Sonoma?

The activation is triggered by linkage pulls the cable that locks the front axles (got that?). The vacuum sits on top of the transfer case. Seals inside the switch keep the fluid inside the transfer case out of the vacuum lines. However, it’s possible for the transfer case to “over-fill” itself with fluid.

Why is my GMC Sonoma transfer case leaking?

Once the fluid makes its way into the lines, vacuum sucks the fluid all through the vacuum system. This is bad. The reason it’s bad is because ATF and HVAC actuators do not play well together. The rubber parts get soft and don’t seal vacuum well. Fluid begins to leak into unsightly places. Over longer periods of

SOME KNOBS MAY LOOK DIFFERENT (TRAILBLAZER, ENVOY, etc..) BUT THE PROCEDURE IS THE SAME. First, make sure you are in 2 wheel drive position on the transfer case. Next, put your foot on the brake pedal and shift your transmission in Neutral. Rotate the dial all the way clockwise, PAST the 4LO position and HOLD IT THERE for approx. 10 seconds.

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Ruth Doyle