How does a transfer case vacuum switch work?
it has three vacuum lines going to it. the switch works similar to a ball point pen, meaning there is a round ball that is either pushed or not. the ball gets pushed by the shift fork inside the t-case, when the case is shifted into 4wd. now, there are three vacuum lines going to the switch.
What is a transfer case switch?
A transfer case switch lets you electrically shift from a two-wheel to a four-wheel drive and vice versa on the fly. In addition to normal wear and tear, there are also other factors that could damage the transfer case switch long before the end of its service life.
Why is the front actuator on my 4WD not working?
The slower flash indicated the axle actuator, the faster flash indicates a transfer case problem. If you were able to put it in low range then the t-case actuator is working. It wont allow you to put it in low until it locks the t-case in 4wd. The front actuator uses vacuum, not air pressure to switch the actuator.
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.
How does a shift on the fly actuator work?
Your system is a shift on the fly, which has an electric actuator that shifts the transfer case into 4WD and signals the front axle actuator to engage the differential by moving a spline sleeve onto the axle thereby stopping the front differential from”freewheeling” and effectively putting the vehicle in 4WD mode.
What’s the switch on the front axle actuator?
The switch on the tcase is the one that activates the front axle actuator, not the dash light, so unless the front axle shifts to locked, I don’t think you will see anything change. Maybe someone else will chime in to help.