Results 1 to 9 of 9

Thread: ac not working

  1. #1
    Join Date
    Mar 2007
    Location
    New York, NY
    Posts
    170
    Rep Power
    15

    Default AC Compressor

    Ac worked fine until I went to the track. Didn't work at all on the way home.Light comes on on the ac button but no cold air, only. Ambient air. Oil temp at 100c. Checked the blend valve by trying full hot and full cold. Full cold gives only ambient. Don't hear the compressor running. What should I check? Where is the compressor? Is there a fuse that I should check?Thanks!Ross
    Last edited by rbarna; 05-18-2007 at 09:11 AM.
    2006 M400 (143 of 220) [SOLD]
    2002 Van Diemen Zetec Formula Continental
    2003 Porsche 911 GT3
    2005 Land Rover HSE



  2. #2
    Join Date
    Dec 2004
    Posts
    5,515
    Rep Power
    32

    Default

    Ross,

    This was posted by Mike Evangelo on the Noble1G yahoo site back in February 2005. Have you tried the A/C again after the car had a chance to really cool down?

    "You will find that while running the car extremely hard that the A/C will quit working. At high engine RPM the high side pressures can reach dangerous levels, therefore a high pressure switch in the system will shut off the compressor till the pressures come down. This should happen shortly after high RPM operation stop. This is considered normal operation of the system. If you are racing or driving hard, we recommend that you shut the A/C off.
    If on a hot day the car is run very hard and the under hood temperatures are very high, the A/C compressor may shut off. The compressor is thermo protected by a switch on the compressor itself. If this trips, it may not reset till the engine has cooled down.
    All these things are considered normal operation of the A/C and are it’s limitations. "

    Craig

  3. #3
    Join Date
    Mar 2007
    Location
    New York, NY
    Posts
    170
    Rep Power
    15

    Default

    Yes, I have let it cool down over days. And I already read the troubleshooting guide from 1g.
    2006 M400 (143 of 220) [SOLD]
    2002 Van Diemen Zetec Formula Continental
    2003 Porsche 911 GT3
    2005 Land Rover HSE



  4. #4
    Join Date
    Aug 2006
    Posts
    554
    Rep Power
    17

    Default

    Same thing happened to me. Ambient air with A/C on, no compressor. Ended up being a disconnected wire behind the dash. Not sure which wire or where to look, but Mike just fixed it a couple weeks ago. Might want to give him a shout.

  5. #5
    Join Date
    Dec 2004
    Posts
    5,515
    Rep Power
    32

    Default

    While it doesn't sound like Ross is experiencing the intermittant problem, this may be the discussion you are referring to, as originally posed by Joel to Mike Evangelo on the Noble1G yahoo forum:

    "Questions mainly for Mike E.--but any other input is welcome.
    My A/C has developed an intermittent functioning problem. Sometimes it
    turns on normally, with the light in the switch illuminated, but then
    it turns itself off after a few minutes. Other times it doesn't turn
    on at all after the switch is depressed, but might suddenly start up
    on its own some time later. When the light is illuminated, the A/C
    seems to be working fine. The intermittent problem just started
    happening, so I was wondering if there is a particular component in
    the HVAC electrical circuits that should be checked and might be
    causing the problem.
    That brings me to the second question. The first thing I checked in
    the HVAC circuit was the footwell fuses 11 & 12 and the relay--they
    all seemed fine." - Joel

    "We had to cut into the dash on my m400 to find that the guys in South Africa and not plugged the AC plug in correctly - hope that makes sense - I am talking about the wires behind the dash. This is very hard to get to without cutting - thankfully you cant tell we had to do this looking at the car. I wonder if you guys are having the same issue?" -Dodgy

    "There is some good news here and some bad. If the indictor light goes
    out when the A/C does this means the problem is in the power
    distribution to the switch or the switch, a relatively small portion
    of the wiring. This is the good new the bad is as said, some of this
    is a bear to get at.
    Since it much easier to pull the fuse panel I would start there. Look
    behind fuse 11 and 12 and make sure the connections are good. Your
    looking for a White/Red wire that feed the switch.
    If all looks good here you will need to go behind that dash. There is
    no easy way to do this. Lying on the driver side floor and reaching
    behind the dash is the best way to go. You may find it hard to get
    your hand up to the panel. In this case you will need to trim the
    dash as Stephen said. The area you trim is the back edge of under
    dash right of the drives right knee. This is on the vertical edge,
    towards the firewall directly forward of the alarm touch key pad. If
    you reach behind the dash at this point you will feel a steel frame
    about 2-3" in. You can cut a section out about 6" up and down and
    back to this frame. This is well under the dash and not noticeable.
    This will allow you much more room to get your arm behind the front
    panel.
    Now the best you can do is feel around for a loose wire. Turn the A/C
    on and see if you can move any wires that effect this. If so you
    found the problem. I have set some pictures in an album, these show
    the back of the panel, the hole you need to work through and some of
    the wiring. Also it show the nut location that hold the panel in
    place. If all else fails and you pretty sure the problem is behind
    there and you can't get to it, the panel will need to be removed." - Mike Evangelo


    Here are the pictures. They are very helpful in understanding what is required:
    Attached Images Attached Images     
    Last edited by caccobra; 05-16-2007 at 05:29 AM.

  6. #6
    Join Date
    Mar 2007
    Location
    New York, NY
    Posts
    170
    Rep Power
    15

    Default

    I don't think my problem is the same as Joel's cause my AC light comes on every time but the compressor doesn't run.

    I spoke to Mike at 1G and he recommended I check two things:

    1) The electrical connections near the dryer which may have corroded.
    2) Check the charge level in the system, if there is a leak then the compressor won't run
    2006 M400 (143 of 220) [SOLD]
    2002 Van Diemen Zetec Formula Continental
    2003 Porsche 911 GT3
    2005 Land Rover HSE



  7. #7
    Join Date
    Jan 2005
    Posts
    2,809
    Rep Power
    25

    Default

    use the owner's forum.......
    Dino

    Sarthe Grey Rossion Q1 (Sold to a good home in Colorado)
    Wolf GB08 LMP3/CN Sports Prototype www.motorsports-sw.com www.wolfracingcars.com
    Red 2006 A4 (slow but good gas mileage)
    2012 Audi Q7 TDI (Awesome Highway & Tow Vehicle w/Torque and High MPG)

  8. #8
    Join Date
    Mar 2007
    Location
    New York, NY
    Posts
    170
    Rep Power
    15

    Default

    ok... continued on the owners forum.
    2006 M400 (143 of 220) [SOLD]
    2002 Van Diemen Zetec Formula Continental
    2003 Porsche 911 GT3
    2005 Land Rover HSE



  9. #9
    Join Date
    Mar 2007
    Location
    New York, NY
    Posts
    170
    Rep Power
    15

    Default

    FIXED! I took of the heat sheild from under the compressor and changed the wiring to bypass the thermocouple. All better. Wrapped everything in hi-temp tape.
    2006 M400 (143 of 220) [SOLD]
    2002 Van Diemen Zetec Formula Continental
    2003 Porsche 911 GT3
    2005 Land Rover HSE



Posting Permissions

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