HVAC no air from middle vents?

Tiny
BHAMDOC1973
  • MEMBER
  • 2005 LINCOLN TOWN CAR
  • V8
  • AUTOMATIC
  • 190,000 MILES
I did this repair years ago on a Crown Vic or something similar maybe just can't remember what it was. No air from middle vents, or rear air. Only defrost and bottom/leg air. No matter what I chose only the defrost and bottom. I ran the test, and it gave me
12.42
12.63.
12.64
Not sure what these mean.
Friday, January 19th, 2024 AT 10:32 AM

16 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,458 POSTS
Yep, this happens when the mode actuator goes out. Here is the location and how to change it out to fix the problem. Check out the images (below). Let us know if you need anything else.
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Friday, January 19th, 2024 AT 12:17 PM
Tiny
BHAMDOC1973
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Would you remove the dash for this?
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Friday, January 19th, 2024 AT 12:18 PM
Tiny
BHAMDOC1973
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Can you tell me where this is located? I removed the radio and trim but before I go further need more info please.
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Saturday, January 20th, 2024 AT 1:31 PM
Tiny
KEN L
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It looks like it is behind the glove box.
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Sunday, January 21st, 2024 AT 9:44 AM
Tiny
BHAMDOC1973
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The one for mode change? I thought the one on that side us for passenger, some people changed those for when they lost air only on passenger side.
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Sunday, January 21st, 2024 AT 10:48 AM
Tiny
BHAMDOC1973
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I took glove box down and to the left there is one, removed and moved the door by hand nothing change as far as flow, removed cluster and panels under steering and there is another to the right, same thing, moved it and it did nothing.
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Sunday, January 21st, 2024 AT 2:40 PM
Tiny
BHAMDOC1973
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Can you get me the part numbers for the 2 actuators that set behind the dash on the vac blend door assembly?
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Monday, January 22nd, 2024 AT 8:06 AM
Tiny
KEN L
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Yep, the mode actuator is near the glove box, check this diagrams out. Check out the images (below). Let us know how it goes. Sorry I dont have part numbers.
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Monday, January 22nd, 2024 AT 10:27 AM
Tiny
BHAMDOC1973
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This picture looks backwards for some reason. So, the temperature blend ones are on sides, which I can access by hand, I tried turning them and it didn't make a difference now I know they are temp blend ones. Another for recirculation is by blower. The last 2 are hidden. So am guessing the one u marked is one of them and the other is for the foot. Are these numbers corresponding to part number? Based on the codes I got, 2 of them which do you think are bad?
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Monday, January 22nd, 2024 AT 10:34 AM
Tiny
KEN L
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The mode actuator sounds bad to me. That is the one I marked in the diagram above.
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Tuesday, January 23rd, 2024 AT 10:02 AM
Tiny
BHAMDOC1973
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I ordered the replacements for the ones behind the dash. On the other hand, when I try to put back the ones on the side for temp blend doors neither one ligns up. I removed them to check them, which are accessible from under the dash, it only goes in one way and even if I move the doors up the holes still wont lign up. Is there a trick to this?
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Wednesday, January 24th, 2024 AT 6:34 AM
Tiny
KEN L
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Not really, can you move the door pivot on the HVAC system so the actuator can be installed?
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Wednesday, January 24th, 2024 AT 10:26 AM
Tiny
BHAMDOC1973
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Yes, but no matter what neither one aligns. Nothing blocking the doors and I can freely move then.
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Wednesday, January 24th, 2024 AT 10:52 AM
Tiny
BHAMDOC1973
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Is there a way to test the old actuator on the bench?
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Friday, January 26th, 2024 AT 6:03 AM
Tiny
KEN L
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You can check for power and ground to the controller, here is a guide and wiring diagram for the system. Also, you may have the incorrect replacement part for the mode actuator. I don't have a way to test the actuator.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the images (below). Let us know how it goes.
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Friday, January 26th, 2024 AT 11:21 AM
Tiny
KEN L
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Anything?
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Friday, May 10th, 2024 AT 11:44 AM

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