Question about Lincoln Town Car
OK letting someone work on my car they caused a small fire and burnt my vacuum line. I get ac and heat fine but it only comes out the defrost vents. My question is what vacuum under the dash will open a path for the air to come out the dash vents in my 1988 towncar. I think If I can find that I can hold it open somekind of way so I can get air from the dash vents.
You will need to look at the area behind the dash to see if a line was left unhooked at the control panel for the a/c defroster selector. If as you said, a line was burned, you will need to find it further back behind the dash and replace it. An unhooked line will need to be reattached to a small device that may look like a bellows. The are back there is tight but if you had work done, you hopefully still have it open from the front. Any parts store can sell you the vacuum line you will need for this fix. Good luck.
Posted on Oct 19, 2013
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Posted on Jan 02, 2017
SOURCE: There is no air flow
You need part GM Part number 89018675 or ACDelco 15-73596. The Mode Selector Actuator. What happens is the part is a CHEAP part POORLY designed and when it goes to turn the flaps inside the HVAC unit its the plastic gear slips instead of turning the flap!!!
Just to forward you you might want a deal to install this art for you unless your good at fixing your own vehicle, because you need SMALL sockets and a lot of patience to get this part in!!!
The part is ALMOST directly above the steering shaft for your steering wheel, so theres a lot you got to remove before you will even see them!!!
I only recommend you to have a dealer put this part in for you, unless you have your own service manual!!
Because there is 5 of these darn things and if you pick the wrong one you will have to do it all over again!!!
3 on the Drivers side and 2 on the Passengers side!!
But replacing this part SHOULD solve all your problems!! AS it did for me and i was having the same issues as you have described!!
Posted on Jul 22, 2008
There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.
Posted on Jun 19, 2009
I think your problem is mechanical. There is a distribution box behind thedash where flaps divert air to the specific locations although they may be electrically or vacuum actuated it is probably a mechanical linkage to these flaps or something is creating an obstruction. Check all the other connections while you are in there including any duct work to these areas
Posted on Oct 02, 2010
Tips for a great answer:
It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. The "one-way" check valve is usually located in the line and close to the can, make sure it works properly. The valve could be the very thing that's causing the problem. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go, for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. Worst case is a bad vacuum motor or air flow position selector switch, and/or a faulty Blend Door Actuator. If you have been driving around with the Temperature knob or control set at the same spot for months, move it from fully cold to fully hot several times and wait for the air temperature to change each time. This will help reset the blend door and vacuum control system. Hope this helps... Let me know what you find.
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The air controls in the heat/AC system are vacuum operated. When the controls don't cause the air flow to shift it is normally caused by lack of vacuum to the air flow system. This is normally caused by a break in a vacuum or a vacuum line that has come loose from a connection, usually under the hood. These vacuum lines are small black plastic tubes about 1/8 to 3/16 in diameter. My experience has been that places under the hood where these lines are exposed to high heat causes them to get brittle and break or crack. I have found lines that are between the battery and fire wall that don't get much air flow and are heated by the battery are a likely place to look. Look for the line that goes through the fire wall. that is likely the damaged line. Trace it back to find the crack or break. If you find this is the cause, replace all the section of line that is brittle. If you don't do that you will have the same problem again very soon. You can splice sections of this tubing with rubber hose of the proper inside diameter. Good luck.
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