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When I accelerate, my air stops blowing cold. Foot off gas pedal it blows cold again.

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  • When I accelerate, my air stops blowing cold. Foot off gas pedal it blows cold again.

    As the title states, when i'm cruising along at a steady speed, my air is just fine, but if I get on it a little, my air stops blowing cold and just blows warm or less cooler air. I have recently replaced some vacuum lines and my air is working fairly well except this issue. I have searched some of the Air Conditioner posts and it's like finding a needle in the haystack if it's not mentioned in the title. This has been going on for some time and I just realized that the lack of cold air is related to the gas pedal. I would appreciate any help from experience. Thanks in advance. Mike

  • #2
    More than likely it is a vacuum issue, practically everything in the HVAC system runs off a vacuum source. Your best bet is to get a vacuum diagram of the HVAC system and start checking line by line.
    1985 300ZX Z31 2+2 VG33ET (running!)

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    • #3
      Turbo or not? I had the same issue and it was a leak between the vacuum pump and plenum. When the turbo raised pressure in the intake, the vacuum for the climate controls was gone.

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      • #4
        Non Turbo, sorry, I forgot to add that So it's a 87 NA auto

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        • #5
          Vacuum system info



          http://300zx.tombeauchamp.com/service.shtml#052204


          Attached Files
          Last edited by FlyingT; 06-17-2019, 05:43 PM.
          Restore it, Don't crush it. They don't make em like this anymore.

          Scott
          85 Turbo, original owner, restored
          93 NA Babied


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          • #6
            More vacuum info
            Attached Files
            Restore it, Don't crush it. They don't make em like this anymore.

            Scott
            85 Turbo, original owner, restored
            93 NA Babied


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