Only by radiation, if not screened and by conduction, if mounted on a thermal conductor (heat sink)
Max power transfer takes place when the total load impedance is equal to the source (power supply) internal impedance.
On a 1988 Jeep Cherokee, the vacuum transfer case switch is typically located on the transfer case itself. It is usually mounted on the side of the transfer case, near the rear, and is connected to the vacuum lines that control the four-wheel drive system. You may need to crawl under the vehicle for better access to locate it. Always ensure the vehicle is securely supported before working underneath.
This is a stupid system, but heres how it works. Electronic control on dash engages motor in transfer case to engage vacuum sensor on the transfer case, completes vacuum circuit from engine to vacuum operated shift cable under battery tray, cable pulls shift fork inside front diff half shaft, which engages passenger front axle. Very common problem with these is that the vacuum actuator on the transfer case gets stuck, so vacuum is constantly applied to the shift cable actuator, causing it to be in 4x4 all the time. Under the battery tray is the vacuum actuator for the cable, see if it has vacuum when 4x4 is supposed to be off, if so you will have to replace the sensor on the transfer case (not an easy task), or disconnect the vacuum line to the cable actuator to release the shift fork and prevent further damage. Hope this helps, Justin
You have a vacuum hose disconnected or broken. Check under the hood for a small vacuum hose out of place or broken.
Any place there is a vacuum hose, under the hood and under the dash. Also the Power Brake Booster hose. The Booster diaphragm may also be busted. An Intake Manifold Gasket or the Intake Plenum gasket are sources of a vacuum leak.
My guess is you have a vacuum line problem under the hood. When the vacuum supply is cut off the system reverts to it's default position which is floor and defroster. Check under the hood for a vacuum line that is disconnected, pinched, collapsed, cracked etc. A common place for a vacuum line to disconnect would be at the vacuum reservoir. This is the black plastic ball that is attached to the under side of the hood above the brake master cylinder.
January
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.
It takes a large amount of force to remove the piece of paper stuck on the end of the vacuum hose because of the suction force created by the vacuum cleaner. The paper is being held in place by the pressure difference between the inside and outside of the hose, making it difficult to remove. Additionally, the paper may create a seal around the end of the hose, increasing the force needed to break that seal.
Yes, you can according so where you are in the universe, also you can stand under a wall acording to where gravity takes place
January, generally speaking.
Remove all wires attached to the transfer case. Remove the driveshafts. Drain the fluid out of the transfer case. Place a transmission jack under the transfer case. Unbolt the transfer case from the transmission. Unbolt the crossmember the transfer case rests on.