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  1. #1
    Veteran Member Four Rings Theiceman's Avatar
    Join Date
    Feb 15 2016
    AZ Member #
    368804
    My Garage
    2006 A4Q, 1978 911 Targa, 2006 Jetta TDI
    Location
    Cambridge,Ontario

    Rear coolant flange no big deal

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    I don't know what all the hype is about as I had it off in an hour and back on and done in about an additional 90 minutes.

    There is no doubt this job is about having the right tools and the right approach. This job is made way easier with coolant clamps so invest in a set, and they will pay for themselves in beer as your buddies borrow them.

    Also to be fair I have been wrenching cars for almost 40 years . I decided instead of rewriting the process as its been done , I will give some tips to make this job go fast and make it less miserable.

    if you don't skip any of these steps you will be fine , and use them in conjunction with already existing DIYs.
    1. use your coolant clamps to take off the two coolant lines to the coolant reservoir and drain it for use later ( I used a plastic ice cream container ). unclip sensor and one screw removes the reservoir.
    2. 2 torx and one triple square releases the coolant pipe on top, then go to passenger side and unclip the harness for the cam adjuster and anything else on that side , and the coolant sensor underneath. mine came of easy, cut tie wraps as this wiring harness has to move freely to make your job easier.
    3. 1 clamp removes vacuum line from vacuum pump. carefully pull plastic line from firewall and move entire line forward and out of the way .
    4. 3 torx screws removes the vacuum pump , some people use a fancy slim ratchet but I found a torx allen key worked well, the one with the grounds is a bit trickey but some patience pays off. once the pump is off you can check it for leaks.
    5. reach down with a long slotted and release the spring clip for the lower hose. then just lean on it with your weight and rock it back and forth, you will slowly feel it rock more and more then it will give up and fly off
    6. number 8 triple square gets off the flange by feel . passenger side was easy drivers side bolt was a bit trickier as I used a small extension with a wobble end and I could angle up from under the firewall.
    7. when flange releases leave the coolant clamp line on and pull flange up drivers side ( the rubber hose will bend and move as you have the coolant line loosened off, just be carful about evap plastic line to the n-80, move around it carefully. Now you can release that clamp with ease, mark the registration of the flange so your new one is clocked the same way .

    its now out ... now put the new one on and put it all back .. if you put the new flange on clocked exactly as the old one onto the coolant line and bend it back into position .. the coolant hose will hold everything in place perfectly while you put the bolts back in.

    and now for the results .. was my leak really the flange or something else ... drum roll please,...

    [IMG][/IMG]


    umm yeah .. I had to go back actually after comparing mine to my new one, pulled out the " extra piece. "

    its all back together with the exception of the pain in the ass ground bracket that goes on the lower vacuum pump screw and to coolant tank , so about another half hour of work.

    so don't be intimidated by this , just get the right tools and take as much off as you can before you go after the actual flange. I even had a Viton 53 by 2.5 mm oring for my pump.

    good luck.
    Last edited by Theiceman; 12-04-2024 at 10:27 AM.
    2014 A4 2.0TQ Technik Manual
    2006 A4 2.0TQ Manual
    1978 Porsche 911SC Targa
    1976 Yamaha XS 360
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  2. #2
    Veteran Member Three Rings allstock's Avatar
    Join Date
    Mar 19 2014
    AZ Member #
    159879
    Location
    greater sub of Chicago

    You're just a super wrenches that's all.

  3. #3
    Veteran Member Four Rings Theiceman's Avatar
    Join Date
    Feb 15 2016
    AZ Member #
    368804
    My Garage
    2006 A4Q, 1978 911 Targa, 2006 Jetta TDI
    Location
    Cambridge,Ontario

    Quote Originally Posted by allstock View Post
    You're just a super wrenches that's all.
    lol not really, its just about realizing it quicker to actually take more parts off than it is to work around them.
    2014 A4 2.0TQ Technik Manual
    2006 A4 2.0TQ Manual
    1978 Porsche 911SC Targa
    1976 Yamaha XS 360
    Note: PMs disabled, please keep requests for technical help on the forums to benefit everyone:

  4. #4
    Veteran Member Four Rings thenofjboy's Avatar
    Join Date
    Oct 08 2007
    AZ Member #
    21636
    My Garage
    08 S-line QMT6 , B5 KO4 & my german sheppard
    Location
    Jersey City

    ^ This x 2! The more parts off the better, esp when replacing the coolant flange. It's a tad tight back there
    Sean

    The New
    B7---GIAC--BBS--DDM--JHM+S4Exhaust--StaSIS SS--034--AudiUP--USP--RedEBC--IE--DrakesVC#12--B7S4 Brakes--StopTech--GFB DV+--

    The Old
    B5---GIAC-K04--RACETEC--APR--DEPO--AUTOTECH--VMR--FORGE--034--H&R--BILSTEIN--FUJITA

  5. #5
    Veteran Member Four Rings Theiceman's Avatar
    Join Date
    Feb 15 2016
    AZ Member #
    368804
    My Garage
    2006 A4Q, 1978 911 Targa, 2006 Jetta TDI
    Location
    Cambridge,Ontario

    Okay I would be remiss if I said everything went beautifully , unfortunately it did not.

    when putting lst bolt ( lower ) in vacuum pump that holds the ground bracket I found it stripped out quite easily. great , car is no n functional without this as it is a key grounding point. after about an hour of working on it I got a slightly longer bol to grab snug and I loaded it with Loctite. I got very lucky. if it comes loose I will build a small flat L bracket that fastens to the top of the timing cover ( by N205) and goes down the back where I can fasten the grounds on. I did not refasten any of the warring looms to this bracket as I felt it would unduly stress it while the Loctite hardens up. I strapped them to other places. So job is done and im back on the road.
    2014 A4 2.0TQ Technik Manual
    2006 A4 2.0TQ Manual
    1978 Porsche 911SC Targa
    1976 Yamaha XS 360
    Note: PMs disabled, please keep requests for technical help on the forums to benefit everyone:

  6. #6
    Veteran Member Four Rings dalmation53's Avatar
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    Aug 20 2013
    AZ Member #
    121389
    Location
    Miami

    Quote Originally Posted by thenofjboy View Post
    ^ This x 2! The more parts off the better, esp when replacing the coolant flange. It's a tad tight back there
    I like it tight. wait were you reffering to wrenching? oh my bad hahah
    Ivan

  7. #7
    Veteran Member Four Rings thenofjboy's Avatar
    Join Date
    Oct 08 2007
    AZ Member #
    21636
    My Garage
    08 S-line QMT6 , B5 KO4 & my german sheppard
    Location
    Jersey City

    Quote Originally Posted by dalmation53 View Post
    I like it tight. wait were you reffering to wrenching? oh my bad hahah
    LOL....tighter the better right? work is super slow..Ive been waiting for someone to make a comment like that!!! thx
    Sean

    The New
    B7---GIAC--BBS--DDM--JHM+S4Exhaust--StaSIS SS--034--AudiUP--USP--RedEBC--IE--DrakesVC#12--B7S4 Brakes--StopTech--GFB DV+--

    The Old
    B5---GIAC-K04--RACETEC--APR--DEPO--AUTOTECH--VMR--FORGE--034--H&R--BILSTEIN--FUJITA

  8. #8
    Veteran Member Four Rings dalmation53's Avatar
    Join Date
    Aug 20 2013
    AZ Member #
    121389
    Location
    Miami

    Quote Originally Posted by thenofjboy View Post
    LOL....tighter the better right? work is super slow..Ive been waiting for someone to make a comment like that!!! thx
    HAHA you welcome bro same here work is slow.so here in the forums trying to make the day go faster.
    Ivan

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