To replace the vacuum hose that runs to the front vents, first, locate the hose connected to the intake manifold or vacuum source. Carefully disconnect it by loosening any clamps or clips. Next, measure and cut the new vacuum hose to the appropriate length, ensuring it fits snugly over the connection points. Finally, reattach the new hose and secure it in place, checking for any leaks by testing the vacuum system.
There is more than one vacuum hose. Which one? The one that controls the opening and closing of the vents for cold air distribution
The best way to repair a vacuum hose on your Chevrolet is to replace the vacuum hose. The vacuum hose is held in place with a retaining clamp on each end of the hose.
One of the vacuum hoses is probably broken. I had the same problem on an 89 vandura. Turned-out to be that the hose was gummed and couldn't hold the vacuum. It was a hose connected to the vacuum reservoir (ball-like object attached to the hood). Good luck.
Depending on where the leak is you just replace the vacuum hose or the bad part the hose is attached to.
Usually it's because of a vacuum leak from a defective hose or a vacuum hose that is disconnected. Sometimes, if it has a vacuum canister, the canister is bad or the vaccum hose has fallen off or somebody forgot to reconnect the hose. Usually it is a very small hose that you will need to find, like 1/8 inch. This is caused by the vacuum from the engine intake manifold not getting into the cab. Check that vacuum line for soft spots, kinks or being disconnected. Good luckJoe The vacuum is used to activate vacuum motors which open and close doors in the air ducts. The doors control the flow of the air to the correct vents. For instance, warm air is sent to the vents below the windshield to provide a defrost function. Cold air is often sent to the vents on the front of the dash for air conditioning. After a period of time, the diaphragms in the vaccum motors will begin to leak causing the vacuum motor not to work. This is a common problem on 1980's Mercedes and can only be remedied by replacing the vaccum motor. But, first check for loose or leaking hoses and fittings or a defective vaccum switch. The vaccu
There should be a vacuum hose diagram on the front of the driver side strut tower.
If the fan is working but not blowing air out of top vents, It is a vacuum hose. You need to take engine cover off to get to hose.
It's not vacuum. Try this link http://www.chrisfransen.com/Ford_Blend_Door_Fix/index.html
replace the vacuum shift diaphragm lacated on the side of tranny make sure vacuum hose has no leaks or cracks in it or just replace it w/ good non collapsable vacuum hose
You have a broken vacuum hose under the hood that supplies the switch.
Just pull off the old vacuum hose, cut an appropriate length of the correct sized replacement hose and push it on. If you can't find, or get, the right sized vacuum hose, windshield washer hose is often an acceptable replacement. BTW, it is totally acceptable to replace those hard plastic vacuum lines with rubber vacuum or washer hose.
The front axle shift motor will not engage if: A. No power / bag grounding or the more likely failure is B. No Vacuum (4wd will not engage unless vacuum line going to the module is working properly) check/replace vacuum hose