most likely a vacuum leak or faulty control on the dash
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.
The vacuum actuator is either in the fender or under the battery. The actually diff actuator is on the back/bottom of the front diff. Mine (2000 blazer) is under the battery. It sucks to get to. If you check the actuator and it doesn't move at all, check the vacuum, if it's not getting vacuum, check the switch on the top driver's side of the transfer case. It sends vacuum to the actuator. It has three vacuum hoses coming off of it. It costs fifteen dollars at autozone and usually greatly improves the performance of the acuator.
This sounds like a YJ jeep issue, I eliminated the vacuum actuator by installing a heavy duty choke style manual cable attached to the vacuum actuator arm, that way I can lock the front diff when I wanted. Make sure you cap off the vacuum line, otherwise your engine will run poorly.
No, it is electric
On a Dodge Ram, it runs from the intake manifold, to the switch on the transfer case, to the front axle shift actuator.
What year is your blazer? Most common cause for it to not go into 4x4 is the vacuum actuator. The actuator is run by vacuum from the transfer case. The vacuum compresses the rubber diaphragm which pulls a cable on the front differential to lock it in. The rubber diaphragm is prone to break down and if there are holes or tears in the rubber it will only suck air and not have the amount of vacuum needed to pull the actuator cable. This actuator is commonly mounted under the battery tray. Easy to remove and inspect. 1998 blazer There is a vacuum switch on the transfer case that usually goes bad. I have replaced mine 3 times. Factory lasted until 225,000 miles and had to replace the aftermarket 2x since, one only lasted a year.
The actuator of the Dodge Ram 4x4 is located on the top of the front differential. Depending on the year, the actuator is either vacuum or manually operated.
Under your battery tray
on the front axel
Idle speed is not adjustable. If the speed is incorrect you have a computer, sensor, actuator, vacuum leak issue.Idle speed is not adjustable. If the speed is incorrect you have a computer, sensor, actuator, vacuum leak issue.
The transistor replaced the vacuum tube, allowing radios to get much smaller and portable.
It is part of the cruise control.
guessing that you have one fo the central axle disconnect systems. the transfer case vacuum switch, and the vacuum actuator on the axle are both prone to failures, but easilly replaced. there are numerous aftermarket kits to convert to a manual, cable operated system, adn remove the vacuum components entirely.
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.
If it's an actuator that works off an electrical circuit, apply electricity (the body of the device will be - or negative or ground if there is no - or negative or ground wire to the device)/ if it is a vacuum device, then you will need to apply vacuum to determine it it "actuates".
There is a heater control valve on the 1999 Ford Ranger. There is no thermal vacuum valve on this year of the vehicle.
because your transfer case switch is letting it come through the vacuum line to your actuator needs to be replaced and lines cleaned out. but while your at it take the top plug out of the transfer case and see if a bunch of oil runs out as this can cause the vac line to fill up. if a bunch of oil comes out the seal between the trans and transfer case has gone south and needs to be replaced but if the oil level is fine in the tc change the tc switch change the actuator and clean out the vacuum lines and all should be good.
Vacuum tubes were first replaced by transistors, and later by integrated circuits.
your blend door is vacuum operated, most likely your machanic forgot to hook up the vacuum hose to the blend door, the actuator is designed to operate on 5inch pounds of vacuum so you should not notice any engine performance problems.
There is no vacuum switch. There is an electric actuator on the front left of the front end assembly right in front of where the cv shaft goes into the differential case and an electric actuator on the rear right of the transfer case.
It will either be the vacuum solenoid (actuator) located under the battery tray or the electronic solenoid on the front differential. Most commonly it is the vacuum solenoid (actuator). Once you take the battery and battery tray out you will see the rubber bladder of the vacuum solenoid (actuator) if it is torn or busted replace it. Check the vacuum solenoid (actuator) located under the battery and battery tray. It could also be the vacuum solenoid located on the firewall above the distributor (approx. 3"x1")
The vacuum switch/actuator for the fan shutter is under the dash directly below the radio . IT is NOT easy to get to.
One can get parts for a 1990 Hoover junior vacuum cleaner at ransomspares or at espares. These places have many old spare parts for your old equipment and can get them replaced for you easily.