Ford Trucks and SUVs
Ford F-150

What makes the AC on a 1989 Ford F-150 not blow from the dash vents and only the defroster?


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2004-06-14 08:16:32
2004-06-14 08:16:32

usally it is because of a cracked vaccume line(hose) from the intake manifold to the dash controls.usally heat makes the line crack-some vaccume canisters develope a crack in them - this will cause the same problem probably the vacum value connected to the vent controls. If there is a broken vacumn line or if the value is bad, it could cause this to happen


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if you are talking about the automatic sensor that automatically turns the lights on and off, it is on the dashboard probably in between the defroster vents it is probably a small plastic or glass bubble usually you have to remove a large portion of the dashboard to replace it

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You are having a vacuum loss. Check the hard plastic line that is on the right side under the hood for holes. I replaced mine and it fixed the problem. 1992 F150

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The Ford F1 50 air conditioning vents are held in place by four retaining clips. Pry outward on each retaining clip. All of the air conditioning vents can be removed this way.

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One reason a 1989 F-150 may not start is a bad battery.

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