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HVAC/AC weak airflow through vents

Discussion in 'The UK and Ireland' started by James3637383, Jul 8, 2018.

  1. James3637383

    James3637383 New Member

    Joined:
    Jul 8, 2018
    Messages:
    1
    Location:
    Uk
    Its been pretty hot in the UK for the last few weeks and Ive noticed a fault that comes and goes with no fault codes ( remote access by tesla engineer). Basically the A/C can be on max output through front vents and not give out air , you can hear the fan working but sometimes it does not come through. There has been a time when an ice partical came through and i am getting the impression something over proglonged use is freezing up and blocking airflow. The Glass Roof enhances the temp issue in the car and its gets very hot in the car to an almost undrivable situation especially with 3 children in the car. I dont believe it to be a gas leak as sometimes it runs faultless. When precooling after a long drive and A/C use its struggles to get below 21 degrees inside the car .

    Car is due into the SC next week but i know its going to work fine during the 30-60 mins inspection. Wondering if anybody else has had this or can give me knowledge to ensure SC checks for faults.

    Note: range mode is OFF and ive preformed all the resets.
     
    • Like x 1
  2. Derek Kessler

    Derek Kessler Member

    Joined:
    Apr 15, 2016
    Messages:
    984
    Location:
    Cincinnati
    I ran into the same in the US yesterday. 100-mile/160-km drive through an 85F/30C sunny afternoon and the car did fine for the first 2/3 of the trip, but then the cabin fan speed plummeted and it couldn't keep the cabin remotely comfortable for the rest. Range mode off, reset the MCU, no change. AC unit was definitely running at full blast, but very little was actually venting into the cabin.

    Scheduling a SC trip for next week because it's only going to get hotter.
     
  3. ewoodrick

    ewoodrick Active Member

    Joined:
    Apr 13, 2018
    Messages:
    1,090
    Location:
    Buford, GA
    Those sound like a condenser freeze up. Turn off the A/C, but turn the fan on to give the ice a chance to melt.
    If you are keeping the temperature low (below 21c/70f) then you may want to drive with it a little higher. That give the compressor a chance to stop periodically and let the ice melt off. If you keep it at 19c/66f, then it will probably never turn off.

    Just raise the temp to 22c/72f and I suspect that the car will be a LOT cooler. If it does get warm, increase the fan speed, don't decrease the temperature.

    This is not specific to the car, most other A/C systems/refrigerators can do this.
     
    • Informative x 1
  4. Fellsteruk

    Fellsteruk Member

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    Feb 24, 2018
    Messages:
    585
    Location:
    North West, UK
    Pretty hot lol that’s an understatement :)
     
  5. Subevo

    Subevo Member

    Joined:
    Sep 10, 2017
    Messages:
    92
    Location:
    Scotland
    Yes temp was 33.2 Celsius last week a record.i love the glass roof but it definitely makes the cabin hotter plus probably makes the roof heavier than a steel or aluminium version.
    I remember watching a video of the Mitsubishi evo reducing the weight of the roof and it made car handle better.

    I think the air con struggles with the recent temps we've been getting.
     
  6. Fellsteruk

    Fellsteruk Member

    Joined:
    Feb 24, 2018
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    585
    Location:
    North West, UK
    We’re all struggling with the temp :(
     
  7. WannabeOwner

    WannabeOwner Active Member

    Joined:
    Nov 2, 2015
    Messages:
    2,783
    Location:
    Suffolk, UK
    Get yerself a nice shiny Passivhaus. Max temp we have had in the house is 23C as the insulation for Winter works in reverse in summer of course :) (albeit not quite so hot in Suffolk, but didn't get over 23C last summer either and I think we had 30C-ish here too)
     
  8. GeorgeSymonds

    GeorgeSymonds Member

    Joined:
    Mar 16, 2018
    Messages:
    192
    Location:
    NJ
    Going to state the obvious - but you never know - have you changed the direction of the air vent? Some positions close it or at least restrict air flow heavily.
     
  9. morrisdl

    morrisdl Member

    Joined:
    Dec 4, 2017
    Messages:
    199
    Location:
    Smith Mt Lake, VA
    Mine has froze up a couple times, but not since I removed the phone holder from the vent. Never happened out west in the hot and DRY climates. It only has happened to me in drives over 3 hours in the hot and HUMID south eastern US.
     
  10. .jg.

    .jg. Member

    Joined:
    Feb 27, 2018
    Messages:
    267
    Location:
    Weston Super Mare, England
    My car had really poor air flow until I swapped the cabin air filter (Aliexpress) and used one of those air con cleaner foam sprays to clean out the air system.
     
    • Like x 1
  11. ShadowShook

    ShadowShook New Member

    Joined:
    Aug 29, 2018
    Messages:
    1
    Location:
    CUMMING, GA
    Thank you!! You may just have saved my life-had ZERO air coming out of the vents, turned the a/c off and VOILA! My hero.
     

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