A/C coming out of defroster and will not go to any other settings
In the engine compartment I have found a loose vaccume hose near the firewall. This hose has a fitting coming out of the hose and I am guessing that it connects to another hose(the fitting is straight, plastic, approx 3/4").AsI trace it BACKWARDS, it goes to another hose. PLEASE HELP. I was in the Navy for 10 years (74-84) so my military mind will not let me quit untill I figgure the Damn thing out!!
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Re: A/C coming out of defroster and will not go to any...
It is a loose vacuum line, and you'll just have to trace it by hand as to where it needs to go. You might be lucky and have a vacuum line diagram under the hood, or you could buy a Haynes or Chilton's manual for the diagram. Vacuum is what controls the dampers in the air box(s), and with that line being loose you aren't getting sufficient vacuum to move them.
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Check the vacuum lines in the engine compartment that go to the firewall if your A/C switches to defrost on your 1997 Cadillac Deville. Find an approx 1/4" rubber hose that goes into the firewall around the center of the firewall and trace it back to the motor and make sure it hasn't come loose. If not that, then it may have come loose at the a/c control panel. hope it can help you and good luck--------------------------------------------------------------------------------------------- OBD2 Fault Code Reader
I had the same problem on my 1986 300ZX. I replaced the vacuum hoses and it fixed it. The bad hose was a pain to replace. It runs from the black canister at the right front of the engine compartment all the way through the fire wall, passing through a 1" rubber grommet. If you pull that hose loose at the canister and then pry that grommet out, you can replace it without tearing the dash apart. If you reach up on the right side of the transmission hump that line connects at at a T junction you can reach. Disconnect it from the T junction. Then, use electrical tape to securely tape a new vacuum line alongside the old one. Then carefully and slowly pull the new one through the dash maze with the old line at the hole in the firewall. Then once the new one is through the firewall, thread the new line through the firewall grommet and place it back in the firewall. Then just run the new line up to the canister and you are done. The other lines are inside the engine compartment and are easily replaced.
plurbaby236, The venting system for the front of your vehicle is controlled by a vaccum line coming from the engine the rear is electric. You may have a broken vacuum line in the engine compartment. When this happens the defrosters are a default setting. Check for a small vacuum line going through the firewall, usually near the middle and follow it. You may find that it is broken. A quick repair is to take a small piece of rubber hose that fits snuggly on the plastic vacuum hose. Good luck with this.
I'm not 100% sure if your vehicle has this type of heat activation, but lift the hood and find a small black plastic hose coming from the firewall to a vacuum port on the left side of the engine compartment. Inspect this hose for proper vacuum and proper connection. This hose is what gives your heat and A/C system vaccum to open the doors inside the cabin during heat selection. Give it a try.
I'm pretty sure the door that directs the air between the defroster and front vents is vacuum actuated. Check the vacuum lines in the engine compartment that go to the firewall. Find an approx 1/4" rubber hose that goes into the firewall around the center of the firewall and trace it back to the motor and make sure it hasn't come loose.
If not that, then it may have come loose at the a/c control panel. That will be much more difficult to get at to check. You may be able to access it through the front of the dash.
Appears to be stuck in the defrost position and sounds like a possible vacuum leak to controls. Look on the firewall under the dashboard. Maybe you can see a vacuum diafhram with a small hose disconnecedt. Look on passenger side first.
If not, Chk to see if a vacuum hose going through the firewall from the engine compartment has come loose. good luck
do you have a source of vacuum? normal problem occurs on the vaccum line from the engine to the vacuum switch of the car. unplug the vacuum hoses from the rear of the switch and feel if there is hose that is sucking your finger. if there is none, then trace the line towards the engine firewall out to the engine compartment. it could be broken that is why it is stuck in defrost mode.
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