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In this video I have a look at an old school vacuum HVAC system on a 2003 Ford F-150. This one the customer originally complained about "No A/C." Come to find out, it is more of a problem with the mode operation than lack of A/C. -Enjoy
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49 thoughts on “Ford f150: heater works on defrost vent but not on floor or max a/c”
  1. Avataaar/Circle Created with python_avatars Ace Tobon says:

    Nice video. I bet 9 out of 10 jalopy owners would leave it unrepaired.

  2. Avataaar/Circle Created with python_avatars LookingUp says:

    $1,100 dealer charged to replace ours in July.

  3. Avataaar/Circle Created with python_avatars Ro Cayas says:

    The extra wire on the panel is an on/off passenger airbag switch. I have it on my 2002 f-150.

  4. Avataaar/Circle Created with python_avatars I'm not the nice guy says:

    Hey my vents blow Heat all the time when it's on hot and it blows cold all the time when it's on cold but when I drive is costly heat coming from all the vents even the floor vents and when I cut the heat on to try to defrost the window it's a smell of like antifreeze and it fog the window what do you think it could be

  5. Avataaar/Circle Created with python_avatars Gary Wheeler says:

    Mine only work on defrost and low and hugh

  6. Avataaar/Circle Created with python_avatars Cash Dollar says:

    The Ford computer has dozens of adjustments—like turning off the dinger. You can even turn off the artificial engine sound.

  7. Avataaar/Circle Created with python_avatars Lauriano Paniagua says:

    Hi Eric. I have a f150 2006. I have a problem with my switches if I turn my seat heater on it turns my dashboard on instead, if I put the air on my feet it turns the air on on a different setting. What do you think is the problem?

  8. Avataaar/Circle Created with python_avatars Alex Vazquez says:

    I have an 07 grand prix gxp and my AC went out. Compressor wouldnt turn on. A mechanic told me it was my controls so i went to the salvage yard and replaced the controls and it worked, for a couple of days and now it doesn't work again. Any idea what i should try next?

  9. Avataaar/Circle Created with python_avatars InternetDude says:

    I have an 03 F150 this was the first thing I fixed on my truck when I got it. You just need to replace a few O-rings, there are videos here on YouTube on how to do that. Could have had the whole job done in under an hour. Too many uneducated people just replace the HVAC head unit which is a complete waste of time and money.

  10. Avataaar/Circle Created with python_avatars MrsSunshine75 says:

    I have the earthquake cordless 1/2” impact & 3/8” ratchet because Eric O. uses them, just sayin.. & so far after a couple months I’m very impressed, On another note I’ve had a earthquake 1” air powered extended anvil impact that’s been taking off big truck wheels for prob 9 yrs with no problem!!

  11. Avataaar/Circle Created with python_avatars Kevin Wood says:

    Guy, I really like how you actually test for functioning before you make your conclusions. Old School Mechanics! Not tought in classes anymore. (40+ year master tech here, forced into retirement)

  12. Avataaar/Circle Created with python_avatars throttle bottle says:

    vacuum tubing and fittings are the most impossible things to keep around, they vanishing thin air non stop!!!

  13. Avataaar/Circle Created with python_avatars throttle bottle says:

    use a tee fitting, then you can have the gauge reading while the vacuum actuator is connected, way easier to tell if they're leaking or a linkage/damper is busted/stuck, unless you can hear the hissing. but that's kind of hard with small lines and big pots buried up in the dash

  14. Avataaar/Circle Created with python_avatars BR549 says:

    e-bay offers these units refurbished for $49.99 with three day delivery…check it out. Common problem in Crown Vic's

  15. Avataaar/Circle Created with python_avatars James Costello says:

    Give me back the three way fan switch and the two slide levers. They never broke.

  16. Avataaar/Circle Created with python_avatars Luis Olivero says:

    loving nick starks suggestion

  17. Avataaar/Circle Created with python_avatars allan mitchell says:

    Lets see if we can fix it

  18. Avataaar/Circle Created with python_avatars Dave says:

    Please turn off the door chime… Come on Mr O. . jk : )

  19. Avataaar/Circle Created with python_avatars jake ounce says:

    So the controller just "sucks"!!

  20. Avataaar/Circle Created with python_avatars Jeremy hanna says:

    Shoot no field trip to the u pull for me ma'am said no (last time I brought 2 cars home)

  21. Avataaar/Circle Created with python_avatars AvE says:

    Is this the place giving away used impacts?

  22. Avataaar/Circle Created with python_avatars Big Dog50001 Automotive says:

    Well that job sucks….and blows….

  23. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Great video Eric O

  24. Avataaar/Circle Created with python_avatars Chepo's garage says:

    FordTechMakuloco has a video on how to fix this and it is really simple to do. Shoud check it out

  25. Avataaar/Circle Created with python_avatars Jonathan Cisneros says:

    These stupid fords. Them interior noises

  26. Avataaar/Circle Created with python_avatars Meterman says:

    Eric….Question In theory shouldn't I be able to diagnose this with a vacumn pump also?

  27. Avataaar/Circle Created with python_avatars Paul1958R says:

    Eric,
    As always a great video and diagnosis. The minute I started watch I recalled that you had a similar situation a few years ago on a late model Crown Vic/Grand Marq and that my recollection was that you disassembled it and replaced the internal o-ring seals. If you do go salvage yard route please take us along. I see lots of those units on ebay for $100-$150.
    SMA#1
    God bless
    Paul

  28. Avataaar/Circle Created with python_avatars rszymczak says:

    And he writes, Check out YouTube channel, fordtechmakuloco. He has a video showing how to replace the O Rings on the control box from a ford 150. I’d like to see your take on tackling this repair.

  29. Avataaar/Circle Created with python_avatars spelunkerd says:

    Spending most of every day doing electrical repair, it is interesting to diagnose a vacuum driven system. Even so, fundamentals are the same! Tubing can have holes (short to ground), or get kinked or plugged (open). I wanna see you do a vacuum drop test, ha ha. By the way, those tubing connectors look a lot like the connectors used for garden irrigation sprinkler systems. Lots cheaper at the gardening section of the hardware store compared to automotive parts stores, and I know they work for windshield washer tubing connectors, too.

  30. Avataaar/Circle Created with python_avatars DenverTrucker says:

    Hey Eric, this might help you with this, " Ford HVAC System Stuck on Defrost: EATC Control Head Repair " by " FordTechMakuloco " here on Youtube.

  31. Avataaar/Circle Created with python_avatars Dan Clack says:

    Can we get a link on where to get the napkin?

  32. Avataaar/Circle Created with python_avatars Todd G says:

    Did you end up replacing the o-rings or going to the junkyard and buying another controller?

  33. Avataaar/Circle Created with python_avatars Randy Andrews says:

    Got my muck boots and rain jacket, let’s go pick some parts. I’ll bring the coffee.

  34. Avataaar/Circle Created with python_avatars Teri and TL Stanbro says:

    Yo Eric you should got a little Pom-Pom and let the air blow on it😂😂

  35. Avataaar/Circle Created with python_avatars Broken Patriot says:

    But wait there's more. Lol

  36. Avataaar/Circle Created with python_avatars Ion Racer says:

    Before i even watched i knew it was those stupid solenoid orings…done half a billion of em..

  37. Avataaar/Circle Created with python_avatars Brian Beard says:

    Im getting deja vu, didn't you do this with a Vic a while back? I wish I lived l close to you, I bring my Grand Marq and let you chase down electrical gremlins. If ya ever had to Panama City Beach, FL let me know! Yep, Fuck Pick-in-Pull…

  38. Avataaar/Circle Created with python_avatars John Baugh says:

    Power probe, vacuum edition! LOL

  39. Avataaar/Circle Created with python_avatars Stephen McTaggart says:

    Thanks Eric. Good to see you working with air for a change. Love the channel.

  40. Avataaar/Circle Created with python_avatars Mike Chiodetti says:

    Nice Diagnostics! I saw your article in Dec 2018 Motor Age. It was about the 2007 Honda you changed the cam gear and timing belt. You did some testing with the Pico Scope to show where the problem was located. The "bad" gear looked and tested (with your digital calipers) good, but going with your gut instinct, it worked! GREAT ARTICLE. Didn't know they used the picture of you holding the gear at the beginning of the article also as "Figure 6!" Took a little looking, then low and behold there was the answer. Like you, I didn't see any thing bad with the Honda's cam gear, but you made the correct call. GOOD CALL! This video is cool. I had to to do one of these with one of our vehicles at work, PRAYED it would be the controller or the vacuum line, wound up being a bad diaphram . RATS! Replaced part, all's well with that vehicle.

  41. Avataaar/Circle Created with python_avatars JBI AUTOMOTIVE says:

    FANTASTIC CONTENT AS ALWAYS. EVEN FOR HOW CRAMPED THAT FOOT WELL IS, ERIC STILL GIVES US SOME ELBOW ROOM. THANKS

  42. Avataaar/Circle Created with python_avatars Adrian Dawkins says:

    The mystery connecter is for an automatic 4wd knob

  43. Avataaar/Circle Created with python_avatars HUBBABUBBA DOOPYDOOP says:

    WHAT WOULD PHAD DO?

  44. Avataaar/Circle Created with python_avatars HUBBABUBBA DOOPYDOOP says:

    My '89 Buick uses a similar system. Same vacuum accumulator, check valve. The mode door controller is called the "Programmer" and controls the blend door and
    vacuum motors.

    Many of those units are easily repairable. The rubber seals dry out.

    Squirt a couple shots of silicone in it, freshen up the seals. Exercise it with your
    mighty vac and Power Probe.

    Good luck at the P&P.

  45. Avataaar/Circle Created with python_avatars Don Gamble says:

    Waiting on part 2. Anticipating the pick n pull.

  46. Avataaar/Circle Created with python_avatars slowride55 says:

    It does that warm up and freeze crap in NY too? Had a blizzard in November, 50 degrees in December, and another blizzard is coming this weekend here in IL.

  47. Avataaar/Circle Created with python_avatars slowride55 says:

    I would've just sold the truck.

  48. Avataaar/Circle Created with python_avatars W829 L says:

    Man, you're a great dude going out of your way to get parts for these cars/trucks that you work on, and for as cheap as possible.