Vent Issues I think...
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Mountain Pass
Joined: Mar 2016
Posts: 230
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From: Michigan
Vent Issues I think...
I have a couple of concerns maybe you guys can shed some light for me.
1. On my temp control when I select the floor for the air it never comes out of the floor vents. Just curious before I tear into it.
2. When I run my AC it seems to alternate from defrost vents to head panel vents. Just wondering if that is part of its function or is there something wrong.
1. On my temp control when I select the floor for the air it never comes out of the floor vents. Just curious before I tear into it.
2. When I run my AC it seems to alternate from defrost vents to head panel vents. Just wondering if that is part of its function or is there something wrong.
More Turbo
Joined: May 2015
Posts: 633
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From: Staten Island, NY
Could be the vac pump however if you have the eatc controller as opposed to the manual one, the fault could lie there. Very common problem with ford. There are many rebuilders on the net who repair them in one day (circut board medics 99 bucks) is one of them. Check their site for information on how to preform a test to assist in tracking down the problem. Good luck
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Mountain Pass
Joined: Mar 2016
Posts: 230
Likes: 2
From: Michigan
Could be the vac pump however if you have the eatc controller as opposed to the manual one, the fault could lie there. Very common problem with ford. There are many rebuilders on the net who repair them in one day (circut board medics 99 bucks) is one of them. Check their site for information on how to preform a test to assist in tracking down the problem. Good luck
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Mountain Pass
Joined: Mar 2016
Posts: 230
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From: Michigan
Lead Driver
Joined: Jul 2013
Posts: 9,266
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From: In the field...
Additionally you will also want to check your vacuum lines to the hubs and the hub seals. Aside from the aforementioned pump, solenoid and controller.
I usually start with the lines (least expensive) unless I hear or see something else that is obvious.
I usually start with the lines (least expensive) unless I hear or see something else that is obvious.
Moderator
Joined: Jul 2010
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From: Media PA
The vacuum pulse switch should be just to the left of what's shown in the photo above. It's mounted to the passenger side fender just rearward of the battery, it will have an electrical plug as well a couple of vacuum lines attached.
You can see mine in this pic, it has the white plastic cover and the electrical plug is unplugged (safeguard for my mis-matched gears front/rear) and has the red and black vacuum lines on it.
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Mountain Pass
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From: Media PA
From your description of the HVAC defaulting to the defroster position frequently, it sounds like a vacuum leak, so that's what you are looking for. Look for any obvious damage or corrosion to the vacuum pulse switch and/or broken or disconnected vacuum lines anywhere under the hood or down to the hubs. (although the ones after the vacuum pulse switch should hurt the HVAC unless you are in 4WD)
Moderator
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From: Media PA
He has the good engine Mike, no pump to hear.
Moderator
Joined: Jul 2010
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From: Media PA
I think there may still be a little confusion going on here Aaron, your V-10 makes all the vacuum your EX could ever want or need. Gas motors supply the vacuum for all the vacuum powered accessories directly from the intake manifold whenever the engine is running. Diesel engines do not make vacuum like the gassers do so they rely on a separate vacuum pump to produce the vacuum needed by systems like the HVAC control use. A leak in the vacuum system will exhibit symptoms with the HVAC like described, whether the vacuum is generated by the gas engine or diesel's electric powered vacuum pump. A bad enough vacuum leak on the gas motor will also cause some drivability issues and drag the performance and MPGs down as well. On a diesel a bad vacuum leak will have the vacuum pump running constantly like Mike suggested.
You can help avoid some of this confusion by other members trying to offer help by filling out your signature via the "User CP" page. There you can fill out the signature section to show your EX's particulars on every one of your posts, like shown at the bottom of my posts.
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Mountain Pass
Joined: Mar 2016
Posts: 230
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From: Michigan
I think there may still be a little confusion going on here Aaron, your V-10 makes all the vacuum your EX could ever want or need. Gas motors supply the vacuum for all the vacuum powered accessories directly from the intake manifold whenever the engine is running. Diesel engines do not make vacuum like the gassers do so they rely on a separate vacuum pump to produce the vacuum needed by systems like the HVAC control use. A leak in the vacuum system will exhibit symptoms with the HVAC like described, whether the vacuum is generated by the gas engine or diesel's electric powered vacuum pump. A bad enough vacuum leak on the gas motor will also cause some drivability issues and drag the performance and MPGs down as well. On a diesel a bad vacuum leak will have the vacuum pump running constantly like Mike suggested.
You can help avoid some of this confusion by other members trying to offer help by filling out your signature via the "User CP" page. There you can fill out the signature section to show your EX's particulars on every one of your posts, like shown at the bottom of my posts.
You can help avoid some of this confusion by other members trying to offer help by filling out your signature via the "User CP" page. There you can fill out the signature section to show your EX's particulars on every one of your posts, like shown at the bottom of my posts.
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