Results 1 to 6 of 6

Thread: Air Vents Blowing Hot Air Despite Settings

  1. #1
    Join Date
    Apr 2017
    Location
    Australia
    Posts
    3
    My Cars
    2000 E46 318i Executive

    Air Vents Blowing Hot Air Despite Settings

    I've got an auto 2000 E46 318i. I replaced the radiator due to a coolant leak yesterday. I flushed and bled the system after installation but a new problem presented.

    Now the air vents blow hot air (even when the dial is on 3 blue dots and at all fan settings). I scoured the internet for help and read that it could be the Heater Control Valve. Most people had problems with it failing and experienced no heat in the HVAC system but I was wondering if it could fail and lead to too much heat being delivered to the cabin? Any ideas?

  2. #2
    Join Date
    Mar 2017
    Location
    Suffolk, UK
    Posts
    3
    My Cars
    2005, BMW 740 I Sport,
    Hi
    It sound's like the heater valve unit has stuck in a open position or is not getting signals to operate correctly, check out power to the unit via fuses etc, if ok strip out the valve unit and look for any degrading of the rubber seals and or sticking mechanisms.
    Hope this might help.

  3. #3
    Join Date
    Feb 2017
    Location
    Metairie, LA
    Posts
    596
    My Cars
    2001 325i; 2006 325i
    Is it that it's blowing hot air or is the air just not cold (like the A/C isn't working)?

  4. #4
    Join Date
    Oct 2016
    Location
    Portland, Oregon
    Posts
    13
    My Cars
    1995 318i; 1998 323is
    I've just started having the same issue with my '95 318i. Hot air coming in all vents no matter the dial settings (rotary knobs) for temps(left and right) or which vent selected. I'm tending to agree with 740iss about the heater valve unit stuck open. I was also wondering if it could be the vent flaps are stuck open. ?

  5. #5
    Join Date
    Mar 2017
    Location
    Norwich, Connecticut.
    Posts
    486
    My Cars
    E46 wag. E36 convertible
    DID YOU 'burp' the cooling system? There is a big plastic screw atop....do you know?
    Last edited by Eaglesail; 04-27-2017 at 07:20 PM.

  6. #6
    Join Date
    Mar 2017
    Location
    Norwich, Connecticut.
    Posts
    486
    My Cars
    E46 wag. E36 convertible
    Sensors in the BMW cooling system will send false and with negatives that can, and will cause issues that you describe.
    Last edited by Eaglesail; 04-27-2017 at 07:25 PM.

Similar Threads

  1. Air vents blowing hot air when set for cold
    By feeshta in forum 1996 - 2003 (E39)
    Replies: 19
    Last Post: 04-17-2019, 05:59 PM
  2. E39 540i air vent blowing hot air!
    By twghost in forum 1996 - 2003 (E39)
    Replies: 2
    Last Post: 07-06-2013, 08:03 PM
  3. Replies: 4
    Last Post: 05-14-2013, 09:33 PM
  4. Vents blow hot air :(
    By fahdyehia628 in forum 1991 - 1999 (E36)
    Replies: 10
    Last Post: 06-11-2011, 07:00 PM
  5. Floor vent blowing hot air.
    By ItsDavidU in forum 1991 - 1999 (E36)
    Replies: 10
    Last Post: 06-17-2007, 02:35 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
  •