Audizine - An Automotive Enthusiast Community

Results 1 to 25 of 25

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Coolant drain on the block?

    Doing a water pump this weekend. Might as well flush and do new G12 at the same time. I can't find anyone talking about a block drain. Is that right? I can only drain from that goofy little breakable cock on the bottom hose? That's got to leave a lot in the block.
    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  2. #2
    Veteran Member Four Rings
    Join Date
    Jan 03 2013
    AZ Member #
    106799
    Location
    Baltimore

    Good question. Isnt the water pump basically in the low spot of the block? Maybe pull the coolant lines off the turbo?

  3. #3
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Quote Originally Posted by elscotto80 View Post
    Good question. Isnt the water pump basically in the low spot of the block?
    Hadn't thought of that, but you might be right. Its down pretty low.
    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  4. #4
    Veteran Member Four Rings
    Join Date
    Jan 03 2013
    AZ Member #
    106799
    Location
    Baltimore

    Quote Originally Posted by mtroxel View Post
    Hadn't thought of that, but you might be right. Its down pretty low.
    Right. There isn't any coolant running lower where the oil pan is and the water pump is just above that.

  5. #5
    Active Member Two Rings
    Join Date
    Dec 23 2015
    AZ Member #
    366248
    Location
    Cincinnati Ohio

    There is a drain in the lower radiator hose right behind the radiator.

  6. #6
    Veteran Member Four Rings
    Join Date
    Jan 03 2013
    AZ Member #
    106799
    Location
    Baltimore

    Quote Originally Posted by JDinsmore View Post
    There is a drain in the lower radiator hose right behind the radiator.
    Right, but we are talking about the block of the engine.

  7. #7
    Senior Member Three Rings
    Join Date
    Jan 19 2016
    AZ Member #
    367433
    My Garage
    1997 BMW M3 w/ CES Stage IV Turbo
    Location
    Aberdeen, MD

    I was just recently wondering about a coolant flush....apparently, you simply drain from the radiator drain...and then refill? I'm used to having access to a block drain as well, but maybe you can just run distilled water a couple of cycles/drain, and then add the coolant last.
    1997 BMW M3
    CES Stage IV (651rwhp/615rwtq @ 24 psi)
    2013 Audi A4
    Prestige package, S-Line, 6-speed |IE Stage 2 | IE Performance Downpipe | S4 exhaust swap | ECS Luft-Technik intake | ECS Luft-Technik FMIC | RS4 grille

  8. #8
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Quote Originally Posted by BMWManiac View Post
    I was just recently wondering about a coolant flush....apparently, you simply drain from the radiator drain...and then refill?
    Yea I'm going to refill with distilled water, run up to temp then drain. I'll probably fill the heater core with CLR, you can just blow all that out with your mouth and a hose. Then refill the whole thing.
    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  9. #9
    Established Member Two Rings
    Join Date
    Aug 30 2018
    AZ Member #
    425714
    Location
    Phoenix, AZ

    Quote Originally Posted by mtroxel View Post
    Yea I'm going to refill with distilled water, run up to temp then drain. I'll probably fill the heater core with CLR, you can just blow all that out with your mouth and a hose. Then refill the whole thing.
    This is totally unnecessary and could cause other damages using CLR.. The factory coolant should have absolutely no signs of internal rust at 100k. Just drain and refill and donít worry about it.

  10. #10
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Quote Originally Posted by ps2cho View Post
    This is totally unnecessary and could cause other damages using CLR.. The factory coolant should have absolutely no signs of internal rust at 100k. Just drain and refill and donít worry about it.
    I've done two heater cores. I'm not interested in doing another. I just soak the heater core in CLR, flush it out good and the rest of the system never sees a drop.
    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  11. #11
    Established Member Two Rings
    Join Date
    Aug 30 2018
    AZ Member #
    425714
    Location
    Phoenix, AZ

    Quote Originally Posted by mtroxel View Post
    I've done two heater cores. I'm not interested in doing another. I just soak the heater core in CLR, flush it out good and the rest of the system never sees a drop.
    Heater cores on modern (last 10-15yrs) German cars with strong anti corrosion coolant? The only way I can see a heater core thatís leaked due to rust/corrosion is when tap water has been used as a top off rather than distilled or some garbage non-approved coolant.

  12. #12
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    This is the one that got me. My 99 A4 at 210,000 miles. Looks like stop-leak. But I'd never stoop to using that crap, the the PO only had it serviced at the dealer. Needless to say, this was putting out very little heat. (and no, the Zerex bottle behind it was never used on any Audi of mine)

    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  13. #13
    Established Member Two Rings
    Join Date
    Aug 30 2018
    AZ Member #
    425714
    Location
    Phoenix, AZ

    Quote Originally Posted by mtroxel View Post
    This is the one that got me. My 99 A4 at 210,000 miles. Looks like stop-leak. But I'd never stoop to using that crap, the the PO only had it serviced at the dealer. Needless to say, this was putting out very little heat. (and no, the Zerex bottle behind it was never used on any Audi of mine)

    Donít think Zerex comes in that color yellow - looks like Prestone aka never to be used in a German car and asking for problems!

  14. #14
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Quote Originally Posted by ps2cho View Post
    Donít think Zerex comes in that color yellow - looks like Prestone aka never to be used in a German car and asking for problems!
    I only use G-12
    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  15. #15
    Established Member Two Rings
    Join Date
    May 22 2017
    AZ Member #
    399876
    My Garage
    B8 A4, B3 80q modded to death
    Location
    Wilmington, MA

    Do our heater cores really have those spiral thingys in them? I've never seen a heater core like that... although I'll confess I haven't torn many apart. Usually I just angrily toss them in the trash barrel.
    Be alert! America needs more lerts.
    Eric Law
    '12 A4Q completely boringly stock
    '90 80Q AAN + Megasquirt = great fastness and FOR SALE
    '97 Saab 9000 Aero: sold 5/2017, sorely missed

  16. #16
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Quote Originally Posted by ELaw View Post
    Do our heater cores really have those spiral thingys in them? I've never seen a heater core like that... although I'll confess I haven't torn many apart. Usually I just angrily toss them in the trash barrel.
    That's out of a B5.5. What's inside ours? I don't wanna find out.
    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  17. #17
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Nevermind. I'm not making a big deal out of draining the block. I drained what I could get from the cock on the lower hose, this is what came out. No sediment, no oily haze...looks good enough to drink. I'm sure more will come when I remove the pump, but I'm just going to replace with new.

    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  18. #18
    Veteran Member Four Rings
    Join Date
    Jan 03 2013
    AZ Member #
    106799
    Location
    Baltimore

    Quote Originally Posted by mtroxel View Post
    Nevermind. I'm not making a big deal out of draining the block. I drained what I could get from the cock on the lower hose, this is what came out. No sediment, no oily haze...looks good enough to drink. I'm sure more will come when I remove the pump, but I'm just going to replace with new.
    Nice. That looks pretty good. GL with the rest of the project.

  19. #19
    Established Member Four Rings Novarider's Avatar
    Join Date
    Jul 02 2017
    AZ Member #
    402048
    Location
    Knoxville TN

    Seems awfully red. Isn't it supposed to be pink?
    2011 A4 Avant Prestige S-Line

  20. #20
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Quote Originally Posted by Novarider View Post
    Seems awfully red. Isn't it supposed to be pink?
    I've been topping off with G-13 and that's more of a violet color. So I'm guessing that's what you get when you mix G-12 and G-13.
    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  21. #21
    Established Member Two Rings
    Join Date
    May 22 2017
    AZ Member #
    399876
    My Garage
    B8 A4, B3 80q modded to death
    Location
    Wilmington, MA

    Quote Originally Posted by mtroxel View Post
    I've been topping off with G-13 and that's more of a violet color. So I'm guessing that's what you get when you mix G-12 and G-13.
    G-12.5?
    Be alert! America needs more lerts.
    Eric Law
    '12 A4Q completely boringly stock
    '90 80Q AAN + Megasquirt = great fastness and FOR SALE
    '97 Saab 9000 Aero: sold 5/2017, sorely missed

  22. #22
    Senior Member Four Rings Theiceman's Avatar
    Join Date
    Feb 15 2016
    AZ Member #
    368804
    Location
    Cambridge Ontario

    sorry im late to the party. Took my coolant out at 220K km and it looked brand new so not much to worry about.
    coolant drains from block down to lower hose that goes to rad so no issues, sure you get a little carryover much like you do with oil but nothing to be concerned with.
    for a much faster drain you can pop the quick disconnect off the bottom connection to the rad but if you do that you should replace the oring or it may leak.
    2014 A4 2.0TQ Technik
    2006 A4 2.0TQ 6spd
    1978 Porsche 911SC Targa
    1976 Yamaha XS 360

  23. #23
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Quote Originally Posted by ELaw View Post
    G-12.5?
    More like G-12.8 in my case...but I'm a picky bastard.

    Quote Originally Posted by Theiceman View Post
    for a much faster drain you can pop the quick disconnect off the bottom connection to the rad but if you do that you should replace the oring or it may leak.
    Faster and messier. On the other hand, using that little cock is not foolproof.

    That water pump is not a huge job. Saw a video and it looked like a much bigger deal that it is. I left the intake mani on, and glad I did. Pulled the throttle body off and the expansion tank and had plenty of room. That didn't keep me from putting the new pump on with the coolant temp sensor plug underneath it though.

    I did that Graf all aluminum pump. No fitment problems. Hopefully its less prone to leak at the gasket versus the plastic ones.
    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1

  24. #24
    Established Member Two Rings ericA6's Avatar
    Join Date
    May 03 2012
    AZ Member #
    92979
    Location
    Dallas, Tx

    To flush the system of any air did you simply fill and run the car with the heat on? Or did you use a tool to purge?


    Sent from my iPhone using Audizine
    Past - '05 A6q 3.2L

  25. #25
    Veteran Member Four Rings mtroxel's Avatar
    Join Date
    Feb 24 2004
    AZ Member #
    858
    Location
    Minneapolis

    Quote Originally Posted by ericA6 View Post
    To flush the system of any air did you simply fill and run the car with the heat on? Or did you use a tool to purge?
    First one. Ran it with the heat on high, but I didn't get any heat till I pulled back the hose on the heater core till I got a stream of water out of the little hole.
    11 A4 Q, Prestge, Black
    114,000 miles, APR Stage 1



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
  •  


    © 2001-2019 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.