CorkSport.com is MAZDA PERFORMANCE!
CorkSport.com is MAZDA PERFORMANCE!
Page 1 of 13 12311 ... LastLast
Results 1 to 15 of 193

Thread: How-to: Permanently fix the "no A/C on fan speed 2/3" problem

  1. #1
    Registered Member


    Join Date
    Sep 2009
    Location
    Montreal, Quebec
    Posts
    2,623

    How-to: Permanently fix the "no A/C on fan speed 2/3" problem

    If your A/C light is flickering (or doesn't even come on) on fan speeds 2 and/or 3 this is a simple solution that will hopefully fix it permanently. The original solution posted many years ago never really addressed the root cause of the problem. Almost 3 years later pasadena_commut came up with a solution which would definitely fix the problem, but I always thought it was much too complicated. The method I describe below is simple, cheap, and can be put together and installed in less than 30 minutes.

    This is just a mirror of a how-to I posted here. If you'd like to know exactly why this problem occurs and how the solution works, click here.


    Materials

    The only thing you really need to do this are two resistors that are close to 470 Ohms (yellow-violet-brown) and 200 Ohms (red-black-brown). I'll list everything I used just for the sake of completeness.

    Materials:
    • 1x 470 Ohm resistor (1/4W or greater)
    • 1x 200 Ohm resistor (1/4W or greater)
    • 2x Small/Red crimp-type butt connectors
    • 1x Small/Red solderless quick splice connector
    • 3x 20cm length of hook-up wire
    • 1x 10cm length of 1/4" heat-shrink tubing


    Tools:
    • Soldering Iron
    • Wire cutters/strippers
    • Crimp tool
    • Small flat-head screwdriver
    • Radio removal tool (made from a coat hanger)



    Instructions

    These instructions are merely the process I used, feel free to get creative.

    Prepare the resistors



    Attach wires, solder, and trim

    This is the colour code I used for my wires:
    • Black - Ground
    • White - Input
    • White/Blue - Output




    Add some heat-shrink to isolate everything

    Tape works just as well...



    I pre-crimped and labelled my connectors to make sure I don't mess up




    A quick primer on how to remove a stock Protege radio

    Remove the plastic covers on either side of the radio.


    Insert two bent pieces of coat hanger wire into the holes as shown. You'll feel them lock in place when you get far enough (don't be afraid to force them in there). Push your tools towards the doors while pulling out and the radio should just slide out. You might not get it the first time, but when you do you'll be able to steal a stock radio in less than 15 seconds

    Remember to remove the antenna and main radio harness connectors before proceeding.




    This is the wire you're going to cut (Blue/Yellow)

    It's much easier if you remove the connector from the back of the climate control unit to give yourself more room to work.



    Cut and strip the wire

    Try to cut away from the connector ... just in case you make a mistake.



    Connect the circuit you made previously
    • Connect the "output" to the wire that's still attached to the connector (the right butt connector).
    • Connect the "input" to the wire that's buried in the harness (the left butt connector).




    Connect your ground

    Not very surprisingly, the black wire in that harness is ground. Splice into it or use any other bare metal to make your ground connection. I used one of those fancy solderless quick splice connector's just because I had some handy.



    Enjoy some A/C at a proper fan speed

    Seriously, 3 is the best speed.
    Last edited by CheeseHelmet; 08-05-2012 at 08:49 PM. Reason: Forgot link to pasadena_commut's solution

  2. #2
    Registered Member JiggaBro's Avatar

    Mazda Protege5

    Join Date
    Jan 2011
    Location
    LA, CA
    Posts
    500
    i did it with no hiccups!
    and if I can do it, then a brain dead monkey can do it.... not too sure where to get a monkey.... but you know what i mean

    (btw, 2 is the best speed)
    siggg

  3. #3
    Registered Member tweety2300's Avatar

    2001 mazda protege mp3

    Join Date
    Sep 2010
    Location
    virginia
    Posts
    5,799
    4 is the best...

  4. #4
    Registered Member pasadena_commut's Avatar

    Protege5 2003

    Join Date
    Oct 2005
    Location
    Arcadia, CA
    Posts
    1,204
    Yup, that's a simpler circuit than mine. Good job.

  5. #5
    Registered Member


    Join Date
    Sep 2009
    Location
    Montreal, Quebec
    Posts
    2,623
    Quote Originally Posted by JiggaBro View Post
    i did it with no hiccups!
    and if I can do it, then a brain dead monkey can do it.... not too sure where to get a monkey.... but you know what i mean

    (btw, 2 is the best speed)
    Quote Originally Posted by tweety2300 View Post
    4 is the best...
    ^You people don't know what you're talking about, 3 is the best :P

    Quote Originally Posted by pasadena_commut View Post
    Yup, that's a simpler circuit than mine. Good job.
    It would be even simpler (and probably more robust) if you changed that one bias resistor on the PCB to a lower value, but I didn't think people would want to do that... Oh and sorry, I forgot link to your solution (fixed now).

  6. #6
    ~Rico~ RicoP5's Avatar
    Donated: $5

    2002 Mazda Protege 5, red

    Join Date
    Apr 2007
    Location
    San Antonio, Texas
    Posts
    3,997
    Subd
    Sedan front end,white rx8 wheels ,aac 13' brakes kit(reserved), NGR hub with quick release and sparco wheel, system, hids, exhaust, headers, Injen cold air intake, adjustable rear endlinks,moog front end links, engine bay washer dress up kit, shorty antenna, interior leds,rear hatch led, braided clutch line, jdm tailights, wink mirror,sickspeed horns, CF brake handle, redlinegoods shift boot, cr3 rad brackets. coil sleeves,
    My P5 build thread
    http://www.mazdas247.com/forum/showt...ke-one-too-lol
    emergency part out!

    http://www.mazdas247.com/forum/showt...ajor-emergency

  7. #7
    Registered Member OGLaughtzalotzz's Avatar
    Donated: $5

    2002 Mazda Protege5

    Join Date
    May 2011
    Location
    Newark, NJ
    Posts
    347
    where did you get the resistors from?

    Quote Originally Posted by bazooka joe View Post
    in the NE rust is a color!
    Fuelly
    Fuelly

  8. #8
    Registered Member


    Join Date
    Sep 2009
    Location
    Montreal, Quebec
    Posts
    2,623
    Quote Originally Posted by OGLaughtzalotzz View Post
    where did you get the resistors from?
    Any electronics shop will sell them (iirc radioshack still stocks that kind of stuff).

    Or if you have more patience, ebay! Apparently you can get 50 for a buck (200, and 470)

  9. #9
    Registered Member wallabe's Avatar

    2002 Mazda Protege5

    Join Date
    May 2011
    Location
    Memphis
    Posts
    164
    Quote Originally Posted by JiggaBro View Post

    (btw, 2 is the best speed)
    Quote Originally Posted by tweety2300 View Post
    4 is the best...
    Quote Originally Posted by CheeseHelmet View Post
    ^You people don't know what you're talking about, 3 is the best :P


    Whatever 1 is the best speed. I say we have a Grand Royal Cage Match to find out.

  10. #10
    Registered Member zhy's Avatar

    I aint even mad!

    Join Date
    Jan 2012
    Location
    Montreal, Canada
    Posts
    656
    This calls for a sticky really.
    fan speed preference hahaha. really good work nick, cant wait to meet you tomorrow.
    Follow my build/progress thread here!


    STICKY How-to by me : Custom LED cluster here!

  11. #11
    Registered Member Fresco's Avatar
    Donated: $5


    Join Date
    Apr 2009
    Location
    Brooklyn, NY
    Posts
    631
    sub

  12. #12
    Registered Member IshSonP5's Avatar
    Donated: $5

    2012 MS3

    Join Date
    Dec 2011
    Location
    Palmdale, Cali
    Posts
    730
    sub
    -- 2003.5 MP5 // Finally Boosted -- DED -- 2012 MS3 is the new ride --

  13. #13
    Phenda Bear THE Phen's Avatar

    2013 Abarth, 2004 MSM - FM, '74 BMW Bavaria, 97 Civic EX B18C1

    Join Date
    Jan 2007
    Location
    Munroe Falls, OH
    Posts
    15,768
    There was another write-up done on this a few years ago, but this is definitely a bit better. Nice work.
    MOCO ~ Mazda Owner's Corral Operations

    "I always say, the best Lamborghini is the Audi R8. "

    My Fiat 500 Abarth
    My Mazdaspeed Miata Build Thread
    My '74 BMW Thread
    In Ohio? Check us out!
    My Travel Blog - The Chronicles of Phen

  14. #14
    Asian Persuasion <>< Hank3's Avatar
    Contributor

    2010 Mazda5 GT | 2014 Kia Soul !

    Join Date
    Oct 2002
    Location
    Tallahassee, FL
    Posts
    4,649
    Great job, CheeseHelmet. I never really had the gumption to attempt any of the other fixes for this, but you've made it easy enough where it's now on my radar to do. Even then, I'll probably wait till the Fall to do it. This way the fan will be ready for next Summer!



  15. #15
    Registered Member pasadena_commut's Avatar

    Protege5 2003

    Join Date
    Oct 2005
    Location
    Arcadia, CA
    Posts
    1,204
    Quote Originally Posted by CheeseHelmet View Post
    I used one of those fancy solderless quick splice connector's just because I had some handy.
    Some folks claim that these sorts of connectors are not a good idea for cars. They think that the constant vibration of normal driving causes wear at the wire/metal contact, which can eventually result in the contact failing, or even the tapped wire being cut (worn through). I don't know if this is a real worry or not, but just to be safe I soldered and shrink wrapped all the connections on my fix.

Page 1 of 13 12311 ... LastLast

Similar Threads

  1. Front wiper "intermittent speed" no longer works
    By slavrenz in forum Protege5
    Replies: 16
    Last Post: 04-14-2010, 12:32 AM
  2. Replies: 11
    Last Post: 02-06-2010, 05:44 PM
  3. 2004 Mazda3 "S" Sedan 5-speed FOR SALE!
    By YouFailMe77 in forum Completed Transactions
    Replies: 6
    Last Post: 12-13-2004, 01:42 AM
  4. Replies: 35
    Last Post: 09-28-2004, 02:11 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •