Question about 1986 Lincoln Town Car

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AC in my 1986 Lincoln town car stops working when I am increasing my speed(ie: going up a grade or simply accelerating). It will blow warm air through the panel vents until I reach a steady speed. If I remove the vacuum line from the round ''actuator''(behind the glove box, on the left side), it blows nothing but hot air. I have removed this ''Actuator'' from the vehicle and laid it so I could watch it while I drove for a ride. It has a slide bar in the rear of the unit that appears to control opening and closing the damper dorrs. When I accelerate the slide moves back and this is when the ac stops working

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  • Master
  • 1,168 Answers

Hello.
This is happening because your vacuum reservoir is not working.
The vacuum reservoir maintains vacuum to your AC controls as your engine vacuum drops during acceleration.
Check all your vacuum lines and the reservoir for cracks and you will have this situation solved.
The reservoir was a metal can (like a tomato juice can) at one time but if my memory serves me in 1986 they went to a plastic version.

Take care and thank you for using FixYa.

KL

Posted on Apr 25, 2010

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  • Lincoln Master
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You'll need to determine if there is a vacuum leak before or after the control. Once the vacuum is supplied to the controls, (feed in ) it is distributed as needed depending on where the control is set, and one of the lines coming out of control to various parts of the heat/AC system. The other thing to check, is if there is a small check valve that may be faulty in the supply line that comes through the firewall, to control.
You'll have to follow it back to engine, or likely to booster by master cylinder of brakes. The check valve may be right there. There is also a good chance, that if you just buy a check valve, and install it before the feed line gets to control, that will cure your problem. Once the check valve is installed, it will not allow vacuum drop off when accelerating, thus actuators etc , should stay where they are, unless there is a leak at control or one of the lines to other parts of heater/AC system.

Posted on Apr 25, 2010

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