Vacume? Heating-a/c prob.
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Vacume? Heating-a/c prob.
'95 F150 XLT Ext Cab 4X4 Milage is 98,000 Started late summer having prob. with a/c. Air shifts from dash vents to floor vents when going up hills or demanding more power at any time. With cooler weather now heating does opposite, blown air shifts from floor vents to defroster. No other problems with preformance/drive. Thanks.
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Joined: Jan 2001
Posts: 2,358
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From: Nebraska
Vacume? Heating-a/c prob.
You've got a vacuum leak somewhere. At WOT there's little or no engine vacuum, and the blend doors are moving to their default (no vacuum applied) position. The "coffee can" (vacuum reserve) on the passenger fender would be where I'd start.
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1995 F-150 Supercab XLT 155" 4x4 M5OD 302
1986 F-150 4x4 NP435 300
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1995 F-150 Supercab XLT 155" 4x4 M5OD 302
1986 F-150 4x4 NP435 300
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From: IOWA
Vacume? Heating-a/c prob.
Hope you can make this out o.k. (my first time posting an image). Focus in on the red, yellow, and blue vacuum lines near the firewall/PCV area.
Click on the thumbnail:
https://www.ford-trucks.com/user_gallery/displaythumbnail.php?&photoid=10021&.jpg
Click on the thumbnail:
https://www.ford-trucks.com/user_gallery/displaythumbnail.php?&photoid=10021&.jpg
Senior User
Joined: Oct 2002
Posts: 260
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From: IOWA
Vacume? Heating-a/c prob.
>Hope you can make this out o.k. (my first time posting an
>image). Focus in on the red, yellow, and blue vacuum lines
>near the firewall/PCV area.
>
>Click on the thumbnail:
>
Apparently the thumbnail does not open a full size image. I will try the other option:
https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=10021&.jpg
>image). Focus in on the red, yellow, and blue vacuum lines
>near the firewall/PCV area.
>
>Click on the thumbnail:
>
Apparently the thumbnail does not open a full size image. I will try the other option:
https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=10021&.jpg
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Vacume? Heating-a/c prob.
Bill, Do you have the site where I could look at the Vacuum drawing. Still can't make it out.
Tony
Tony
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From: IOWA
Vacume? Heating-a/c prob.
>Bill, Do you have the site where I could look at the Vacuum
>drawing. Still can't make it out.
>Tony
It is not from a site. I uploaded it to my gallery as a .jpg file. I can e-mail you a blow up of it if you give me your e-mail address. You can then use any .jpg viewer (like paint) to look at it much more clearly.
bill_christensen(No Email Addresses In Posts!)
>drawing. Still can't make it out.
>Tony
It is not from a site. I uploaded it to my gallery as a .jpg file. I can e-mail you a blow up of it if you give me your e-mail address. You can then use any .jpg viewer (like paint) to look at it much more clearly.
bill_christensen(No Email Addresses In Posts!)
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From: US
Vacume? Heating-a/c prob.
When i got my 94 the vents didn't work at all. I had a plasic vacume line broke. The line was red and came from around from the back of the plenum on the pass side near the top. It was broke approximatly where the plenum support bracket attatches. Luckily i was able to pull the broken piece out of the rubber tee fiting and push the other end back in.
Hop this helps or give a good location of where to start looking.
Hop this helps or give a good location of where to start looking.
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Joined: Nov 2002
Posts: 9,987
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From: Memphis, TN
Vacume? Heating-a/c prob.
You have your own vacuum map on the core support, air filter cover, or hood. It doesn't show the details of the A/C system, but you can follow it to check for other leaks.
Your A/C system has its OWN reservoir glued to the evaporator cover behind the silver insulation near the R exhaust manifold. There's a check valve there on a tee that sends vacuum inside the cab to the A/C control. It goes inside thru a rubber grommet on top of the blower housing near the firewall.
Your A/C system has its OWN reservoir glued to the evaporator cover behind the silver insulation near the R exhaust manifold. There's a check valve there on a tee that sends vacuum inside the cab to the A/C control. It goes inside thru a rubber grommet on top of the blower housing near the firewall.
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