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1987 300zx A/C blow only on HIGH (Please Help)

  • Red-Dragon_Akuma
    Red-Dragon_Akuma
    Member
    • 90

    1987 300zx A/C blow only on HIGH (Please Help)

    My A/C works has work fine for a good while now, but a few days ago it i click "Low" and it just Blow on "High" only. I've tried to press high than low and still only works on High no matter what i press before and after. I've tried reading before post but i kinda find anything on it. Please help if you have any idea why.
  • Z_Karma
    Z_Karma
    Administrator
    • 3318

    #2
    I recently had an issue with my auto climate control. Sometimes the fan would not turn on, other times it would turn off randomly.
    I swapped out a few different climate controls and each had the same issue so i knew that was not the problem. I read through some
    old zcar.com threads and found out it may be the fan speed regulator. It's located on the underside of the blower motor assembly.

    Mine just had a problem with the connector being loose. I used some silicone grease on the connector and it worked fine. I then went the extra step
    and took it into work, disassembled the regulator box and touched up all the solder connections, knowing that the digi-dash power supply suffers from weak
    solder joints. I had my dash out 3-4 times last spring/summer and probably caused the problem.

    You might try getting up under there and jiggling the connector to the regulator.


    84 AE/Shiro #683/Shiro #820/84 Turbo
  • Red-Dragon_Akuma
    Red-Dragon_Akuma
    Member
    • 90

    #3
    Thanks Z-Karma, i've havnt had any luck in figuring out what was wrong. I appreciate your adivse and will try putting some grease to see if it works. Thank again
  • bonfire79
    bonfire79
    Senior Member
    • 223

    #4
    you didn't by accident hit that manual defrost did you? my a/c controls started working only high this past fall and no matter what button I pushed, nothing changed. in fact, it seemed like none of the buttons even worked. this went on for a few months and I just drove around with it.... turned out, I had accidently pressed the manual defrost switch when I was removing the control plate back and didn't realize it. I thought the unit was just going out.... I pressed that little button, and everything started working as normal. just something to check!

    Bon
  • Timbo_021
    Timbo_021
    Senior Member
    • 514

    #5
    Will be the fan resistor like Z_Karma said. Replace it and you'll be good to go.
    Straya, +61