How to mod AC to blow COLDER - Page 2

How to mod AC to blow COLDER

This is a discussion on How to mod AC to blow COLDER within the F150 Ecoboost Guides and How-Tos forums, part of the F150 Ecoboost Garage category; Originally Posted by Ducatti20 That's why you have to measure the vent temps.... testing with the Ford diagnostic software showed the pcm cycling the compressor ...

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Thread: How to mod AC to blow COLDER

  1. #11
    Ecoboost Veteran 13Scott's Avatar

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    Quote Originally Posted by Ducatti20 View Post
    That's why you have to measure the vent temps.... testing with the Ford diagnostic software showed the pcm cycling the compressor almost the same amount as stock if you target high 30's / low 40's... a few guy went to low 30's and froze their cores...
    Quote Originally Posted by JJM View Post
    And one ran his at 20 for a while and did not freeze up.

    But yes, you gotta tweak it to get it just right.
    I'm not sure if the South West makes much of a difference with the air moisture but if it can freeze up it will. I'm just putting it out there for someone that does it and then wonders why it doesn't work after awhile running it that cold, then tries to take it to the dealer to fix it.
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  2. #12
    JJM
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    Quote Originally Posted by 13Scott View Post
    I'm not sure if the South West makes much of a difference with the air moisture but if it can freeze up it will. I'm just putting it out there for someone that does it and then wonders why it doesn't work after awhile running it that cold, then tries to take it to the dealer to fix it.
    Don't worry, I'll keep an eye on it

  3. #13
    Eco-Beast Shrek's Avatar

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    I'm looking into this mod. My AC is lackluster at best. I've never been impressed with it 'cept for when I turn it on and it's 78° outside.
    It does indeed seem like the compressor shuts off too quickly.
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  5. #14
    Ecoboost Veteran trev's Avatar

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    Thanks Ducatti

    I've glanced over those threads once or twice but never got the time to go through it in detail.

    Cant wait to try this along with insulating the few exposed AC lines under the hood.
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    Thank you for the write up. Will be done by day's end. Gettin hot in heeer

  7. #16
    Ecoboost Jr Member CNGECOBoost's Avatar

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    I too was not satisfied with the A/C in my truck. Installed a 330K resistor. Vent temp before mod was 43F after 36.5F Outside temp was 84F(parked in driveway). Fan was on #2, recirc was off and max air was off. Will try for a couple of days (supposed to get hotter). Thanks OP for the write up. Used link to find out how to remove the plug from the top of the air box(white tab on bottom, who knew!).
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  8. #17
    Ecoboost Jr Member BOOSTED EGO's Avatar

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    I live in Houston so its 95+ outside right now and very high humidity. I added a 1M resistor to prevent the box from freezing and to ensure the compressor would cycle. I made a 750k resistor and the temps got too low, around 40*, this is too low if it is humid in your area... I went from 51* to 42-44 with the 1M and haven't encountered any issues...
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    Quote Originally Posted by Ducatti20 View Post
    That's why you have to measure the vent temps.... testing with the Ford diagnostic software showed the pcm cycling the compressor almost the same amount as stock if you target high 30's / low 40's... a few guy went to low 30's and froze their cores...
    Does the on board computer control the final temp output? When it was 104 the other day vent temp was 41. This morning it was 68 so tried to see how low ac would be on a cool day, guess what? Still 41. Non mod a/c system.

  10. #19
    Eco-Beast Ducatti20's Avatar

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    Quote Originally Posted by EcoXLT View Post
    Does the on board computer control the final temp output? When it was 104 the other day vent temp was 41. This morning it was 68 so tried to see how low ac would be on a cool day, guess what? Still 41. Non mod a/c system.
    You sir are lucky.... I wouldn't touch that gem of a system!
    Blend door and computer affect final temperature..... Based on the feedback from the evaporator core temp thermistor.
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  11. #20
    Ecoboost Sr Member Badtziscool's Avatar

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    Thanks for taking the multiple AC threads (especially the one with a billion pages) and condensing it to a single post. It really helps with sifting out the unnecessary info.

    I think it might be a good idea to mention that people should check their Freon levels before attempting this hack. That could be their initial problem.
    Last edited by Badtziscool; 07-23-2015 at 12:46 PM.

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