How to mod AC to blow COLDER - Page 14

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 DNA Dan Whoa there. I appreciate the concern. Thank you for the clarification. I did read that long thread believe it or ...

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Thread: How to mod AC to blow COLDER

  1. #131
    Ecoboost Jr Member digitaltrucker's Avatar

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    Quote Originally Posted by DNA Dan View Post
    Whoa there. I appreciate the concern. Thank you for the clarification. I did read that long thread believe it or not. I also read the thread over at f150forum. I have several resistors from 200k to 1000k ohm. My confusion is what Trev just recently posted. He uses a 360K ohm and was showing ~38 degrees. When he goes up to 380K his temp is showing ~36 degrees. So is it more ohms lower temperature? or more ohms higher temperature? From your comments I assume I should start with the highst Ohm resistor that I have, correct?
    I am no scientist, electrician or geek! You do any of this at your own discretion and risk! All I can tell you is that these trucks are all different! Have not seen any 2 trucks act the same with the same resistor. Having said that, I would suggest a 1 meg pot switch, which you can adjust up and downward to test for your system. If you go this route, set it with a multi meter, then install. The donor truck I reference on the other forum has one and is currently dialed in around 370. Rarely does the donor truck ever use recirc or max! Remember, it may take some trial and error. You need to drive it a while for it to sync in with the resistor on the Temp Probe in the evap coil.
    2013 F150 Lariat, with NO AC!

  2. #132
    Ecoboost Veteran trev's Avatar

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    Quote Originally Posted by DNA Dan View Post
    Whoa there. I appreciate the concern. Thank you for the clarification. I did read that long thread believe it or not. I also read the thread over at f150forum. I have several resistors from 200k to 1000k ohm. My confusion is what Trev just recently posted. He uses a 360K ohm and was showing ~38 degrees. When he goes up to 380K his temp is showing ~36 degrees. So is it more ohms lower temperature? or more ohms higher temperature? From your comments I assume I should start with the highst Ohm resistor that I have, correct?
    Stock i was cycling between 41-45*F

    With 360K Ohm i was cycling between 35-40*F

    With 380K Ohm i was cycling between 36-41*F

    Those tests were done with a potentiometer and a fluke meter to verify resistance. I have since settled with using a 400k Ohm resistor.

    Lower Ohms will result in colder temps. Higher Ohms will result higher temps.

    I would recommend starting out with 400k ohm. I would also strongly recommend you monitor AC parameters with Forscan (not required but makes it really easy to see when the compressor is cycling on/off).

    Testing Ohm range should be between 320-420k Ohms. Every vehicle is different so you will have to test and determine the best resistance for yourself.
    Last edited by trev; 07-22-2018 at 04:56 PM.
    2014 FX4 screw, max tow, 3.73, 402a, 5.5', Unleashed 91 & 93, Wagner CAC, solo res DP's, DO water meth inj, Helwig RSB, Bilstein 5100's, 275/60/20 Duratracs, Blizzak DMV2's (winter)

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