On a Dodge truck, the vacuum switch is on the transfer case.
On a Dodge truck, the vacuum switch is on the transfer case.
On a Dodge truck, the vacuum switch is on the transfer case.
The vacuum actuator is on the right side of the axle. The electrical switch is on the actuator. The vacuum switch is on the top of the transfer case.
I do not think that there is a front axle disconnect. If there is then it is vacuum controlled and the problem is either a switch or a broken line.I do not think that there is a front axle disconnect. If there is then it is vacuum controlled and the problem is either a switch or a broken line.
The vacuum switch is on the top of the transfer case. The 4wd indicator switch is on the front axle shift actuator.
the vacuum valve on the transfer case takes engine vacuum, and uses it to engage the central axle disconnect on the front axle when the case is shifted into 4wd. this is also the cause of the slight delay between shifting in/out of 4wd, and the 4wd indicator light turning on/off - real world, on an older Jeep, it takes up to a few seconds, sometimes, for the engine to pull enough vacuum to shift the front axle actuator. Both the vacuum switch, and the vacuum actuator on the axle are common failures, and there are a number of kits on the market to convert the front axle to use a cable actuator
On a Dodge Ram, it runs from the intake manifold, to the switch on the transfer case, to the front axle shift actuator.
Hey mate. It will be the switch on the front axle housing. Whether due to switch problem or vacuum diaphragm problem. Basically the switch is saying it's still in 4wd.
I believe that is the vacuum to engage the front axle when in 4 wheel drive.
Odds are the diaphragm is shot, in the central axle disconnect (CAD). You need to check if you have vacuum at the front axle, and if the vacuum switches from side to side, when you engage four wheel drive. If it does, your CAD is bad. If not, trace your vacuum lines to find the leak.
On 93 S10 Blazer. (things to check)(may/may not be similar to 94) -front axle cable (make sure it moves freely) -vacuum actuator (possibly underneath the battery tray, check it holds vacuum) -4 wheel drive switch (on front axle, check the ball valve on it) -4 wheel drive vacuum switch (on transfer case, ball valve and vacuum) Mine turned out to be a bad axle cable, but it is very common for the vacuum actuator to leak vacuum, thus not engaging the system. There may also be a fuse/relay for 4 wheel drive to check.
Differentials were locked by vacuum pressure on a actuator on the front axle, if there is a problem with this actuator or with your vacuum system the front axle will not engage. You may want to remove the acy=tuator and clean it out, ot locate the vacuum leak in your system.
In front - over the front axle.
The front axle on these trucks have a mechanical actuator that locks the front differential in. They have used vacuum, thermal and mechanical means for this. The mechanical is the most reliable. This is a common fail point on the Chevys/GMCs. It is located on the front axle next to the differential.