Ford F150: Heater Works On Defrost & Vent BUT NOT On Floor Or Max A/C
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Date: 2020-08-05
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Comments and reviews: 10
Mike
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.
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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.
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spelunkerd
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.
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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.
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Paul1958R
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
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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
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HUBBABUBBA
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.
reply
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.
reply
InternetDude
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.
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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.
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MrsSunshine75
I have the earthquake cordless 1/2 impact & 3/8 ratchet because Eric O. uses them, just sayin. & so far after a couple months Im very impressed, On another note Ive had a earthquake 1 air powered extended anvil impact thats been taking off big truck wheels for prob 9 yrs with no problem!
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I have the earthquake cordless 1/2 impact & 3/8 ratchet because Eric O. uses them, just sayin. & so far after a couple months Im very impressed, On another note Ive had a earthquake 1 air powered extended anvil impact thats been taking off big truck wheels for prob 9 yrs with no problem!
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throttle
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
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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
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Alex
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?
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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?
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Lauriano
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?
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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?
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Kevin
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)
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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)
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