Audizine - An Automotive Enthusiast Community

Results 1 to 6 of 6
  1. #1
    Registered Member One Ring
    Join Date
    Jan 12 2018
    AZ Member #
    412365
    Location
    Tulsa/Oklahoma

    Why do I keep having to bleed the system for heat to work?

    Guest-only advertisement. Register or Log In now!
    I have a 04 A4 Quattro 1.8T that recently had the radiator and thermostat replaced as well as having the coolant system flushed 3 times due to an issue with the heater. After the system was bled the heater was working well for a couple of days, but then began blowing lukewarm air again. I have bled the system multiple times on a few different occasions now and the heater blows super hot air each time I bleed the system but then returns to lukewarm in a day or so. I am not losing coolant in the system and the engine is getting to proper running temp and staying in place. Are there any ideas as to why air keeps getting into the system and how can I fix it? Thanks for your help

  2. #2
    Active Member Two Rings
    Join Date
    Nov 03 2010
    AZ Member #
    66528
    Location
    Yorba Linda, CA

    First be sure that you are doing the air-bleeding correctly. The engine has to be shut OFF, not running. Disconnect the sensor connector under the coolant reservoir, then raise the reservoir as high as the hoses allow and keep it there. The reservoir should be kept full and the blue cap off, then pull back the heater hose with the small hole in it until just past the end of the heater pipe. When you have a constant little stream of coolant, push the hose back on and re-clamp. Put the reservoir back and you are done.

  3. #3
    Established Member Three Rings
    Join Date
    Mar 21 2016
    AZ Member #
    370603
    My Garage
    69 Nova
    Location
    California

    For all the hate the 3.0 gets, it was pretty easy to bleed the system. I literally just put a couple liters of G12, couple more of distilled water, until it came out of the bleed screw. Tightened it up, and that's basically it.

    I didn't even lift the reservoir. I *might* have jacked the car up, but I don't remember.

    No problems, hot heat whenever I have heat on.

    3.0 ftw, apparently, lol.
    04 A4 3.0 Quattro 6 Speed
    69 Nova with a bunch of stuffs

  4. #4
    Established Member Two Rings a4lownslow's Avatar
    Join Date
    Feb 12 2014
    AZ Member #
    144887
    My Garage
    2007 Audi A4 2.0T
    Location
    Hudson WI

    Quote Originally Posted by DarkoNova View Post
    For all the hate the 3.0 gets, it was pretty easy to bleed the system. I literally just put a couple liters of G12, couple more of distilled water, until it came out of the bleed screw. Tightened it up, and that's basically it.

    I didn't even lift the reservoir. I *might* have jacked the car up, but I don't remember.

    No problems, hot heat whenever I have heat on.

    3.0 ftw, apparently, lol.
    It’s not 3.0 specific lol. I do a lot of work with the b6/b7/b8 and the reason you had no issues is because when the cooling system is working properly that’s all you should have to do! It will self bleed any air.

    Nowadays i use a vacuum refill tool, but never had issues with simply adding coolant to reservoir.


    Sent from my iPhone using Audizine

  5. #5
    Registered Member One Ring
    Join Date
    Jan 12 2018
    AZ Member #
    412365
    Location
    Tulsa/Oklahoma

    Thanks for the reply. I've only done it with the engine running because that's what I've been reading in my own research. I will definitely try this process and hope for the best. Thanks again

  6. #6
    Veteran Member Four Rings old guy's Avatar
    Join Date
    Dec 28 2006
    AZ Member #
    14483
    My Garage
    CCVR6
    Location
    Western Maryland
    Items for Sale

    Bleeding info in here: Clicky click®
    A4 Motoza tuned Frankenturbo F21L mixed flow turbo / Bosch 550's / 3" MAF / TyrolSport SMIC / FT High Flow Exhaust Manifold / 034 HFC / TT 2.5" DP / Borla Exhaust / Eibach ProKit Springs / Koni Yellows / H-Sport Sway Bars / TyrolSport Brake Stiffeners / HyperShift Short Shifter / Podi Boost Gauge
    A5 Mods to come: Little stuff so far. 20/25mm spacers / H&R OE Sport springs / 35% tint / Neuspeed Power Module

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
  •  


    © 2001-2018 Audizine, Audizine.com, and Driverzines.com
    Audizine is an independently owned and operated automotive enthusiast community and news website.
    Audi and the Audi logo(s) are copyright/trademark Audi AG. Audizine is not endorsed by or affiliated with Audi AG.