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  1. #1
    Senior Member Four Rings CrazyCal's Avatar
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    Coolant Leak under Intake Manifold

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    So, I have a coolant leak under the intake manifold. It doesn't appear to be the common j-plug problem, but a crack in the plastic pipe in betwen intake runners 3 & 4. See pictures below.

    Anyone have a part number? Been searching...

    You can see, very clearly, the crack at the base of the plastic.


    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
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  2. #2
    Senior Member Four Rings Charles.waite's Avatar
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    Nope, thats your crankcase breather pipe/hose.

    CLICK

    How to fix said hose: CLICK

    Its a real bitch....

    One more thing I'll add, make SURE you order the right one. There are 3 revisions of the PCV system. Just check your VIN against the part. ECS has the clearest system of finding the part so I linked to them. Also while you're replacing that you should replace the other stuff to, just to be sure. There's a lot of fragile crap connected to that that is most likely super brittle.
    -CP
    USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - 034 Rear Swaybar (Soft Setting) and Endlinks - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    2008 Black Unicorn (2.0t S-Line Ti 6MT Avant) - Bosch FR6KPP332S
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  3. #3
    Senior Member Four Rings CrazyCal's Avatar
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    So, as far as the coolant leak, could it be that the j-plug is spraying onto the breather hose? There was some coolant around the j-plug, but it didn't appear to be enough to be the source, but as you can see, the breather hose is covered in coolant.
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure

  4. #4
    Senior Member Three Rings A4.1.8turboo's Avatar
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    you can also use this. Itll also prevent future vacuum leaks. I just installed this cause my breather hose was cracked aswell.

    http://www.034motorsport.com/engine-...e-p-22077.html

  5. #5
    Senior Member Four Rings CrazyCal's Avatar
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    Thank you for the info. The kit looks like something I will probably install as preventative maintenance, but the real problem here (at least, as far as driveability) is the coolant leak.
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure

  6. #6
    Senior Member Four Rings Charles.waite's Avatar
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    Quote Originally Posted by CrazyCal View Post
    Thank you for the info. The kit looks like something I will probably install as preventative maintenance, but the real problem here (at least, as far as driveability) is the coolant leak.
    You're sure its coolant? It has that sweet smell? The coolant pipe directly above there has a bleeding/pressure relief screw right above there. Is there any corrosion on that? aside from that I suppose it could be sprayed on there.

    That looks like oil to me, which would be completely reasonable given the size of that crack. If it is indeed coolant though, I have to plead ignorance. Maybe someone else can chime in.

    Also, +1 on the 034 kit. I would get that over OEM parts. I forgot about their kit...
    -CP
    USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - 034 Rear Swaybar (Soft Setting) and Endlinks - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    2008 Black Unicorn (2.0t S-Line Ti 6MT Avant) - Bosch FR6KPP332S
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic stocker - Failing TC Mod

  7. #7
    Senior Member Three Rings A4.1.8turboo's Avatar
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    have you had to top off your coolant?? or did you notice if your low on it recently? if coolant is normal and yu havent touched it, then it shouldn't be a coolant leak.

  8. #8
    Senior Member Four Rings CrazyCal's Avatar
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    Quote Originally Posted by Charles.waite View Post
    You're sure its coolant? It has that sweet smell? The coolant pipe directly above there has a bleeding/pressure relief screw right above there. Is there any corrosion on that? aside from that I suppose it could be sprayed on there.

    That looks like oil to me, which would be completely reasonable given the size of that crack. If it is indeed coolant though, I have to plead ignorance. Maybe someone else can chime in.

    Also, +1 on the 034 kit. I would get that over OEM parts. I forgot about their kit...
    No. It's not the relief screw. It's very possible that it's the j-plug, but too tight of a space to confirm, I am just going to get the j-plug and replace it. If, when I get in there, that's it, great, if not I'll order the part I know for sure I need.


    Quote Originally Posted by A4.1.8turboo View Post
    have you had to top off your coolant?? or did you notice if your low on it recently? if coolant is normal and yu havent touched it, then it shouldn't be a coolant leak.
    Yeah, it's most definitely coolant. I have had to top it off. Still leaking. It's slow. Not gushing.
    Last edited by CrazyCal; 11-07-2011 at 08:02 PM.
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure

  9. #9
    Senior Member Four Rings CrazyCal's Avatar
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    I want to get that breather kit, but I'm kind of confused by the VIN fitment stuff. There are 3 options:

    up to VIN 8E-3-040000

    VIN range 8E-3-040000 > 8E-3-500000

    VIN 8E-3-500000 and up

    The confusing part is the "3" in their listings. I have no 3 in my VIN. The last 6 of my vin is 2xxxxx, but there is no "3" anywhere before it like in the examples above.

    What gives? Someone please explain.
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure

  10. #10
    Senior Member Four Rings CrazyCal's Avatar
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    HELP! I wanna order these parts. lol :)
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure

  11. #11
    Senior Member Three Rings A4.1.8turboo's Avatar
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    yeah the same with me. mines a 2002 AMB engine code. so it doesn't have the 3 as well.

    this the exact the one I ordered. doesn't specify 2002. but its amb engine code. and fits perfect.

    http://www.034motorsport.com/engine-...t-p-19986.html

    you gotta 04 so I dont know.. This one labels your year.
    http://www.034motorsport.com/engine-...e-p-22078.html

  12. #12
    Senior Member Four Rings CrazyCal's Avatar
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    Quote Originally Posted by A4.1.8turboo View Post
    yeah the same with me. mines a 2002 AMB engine code. so it doesn't have the 3 as well.

    this the exact the one I ordered. doesn't specify 2002. but its amb engine code. and fits perfect.

    http://www.034motorsport.com/engine-...t-p-19986.html

    you gotta 04 so I dont know.. This one labels your year.
    http://www.034motorsport.com/engine-...e-p-22078.html
    Yeah, 034 should really clarify that shit.

    Thank you turboo for all your help, though. I love AZ.
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure

  13. #13
    Veteran Member Four Rings JMRQuattro's Avatar
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    Quote Originally Posted by Charles.waite View Post
    You're sure its coolant?
    x2. Coolant turns white when it dries. You can see spots in your pictures where there is dried coolant, but the breather hose itself looks like it has oil on it.
    - Justin -

  14. #14
    Senior Member Four Rings CrazyCal's Avatar
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    Quote Originally Posted by JMRQuattro View Post
    x2. Coolant turns white when it dries. You can see spots in your pictures where there is dried coolant, but the breather hose itself looks like it has oil on it.
    We will see when i tear into it. It's pretty green and oil ain't green. Maybe a mixture of the two since the breather hose has that crack. The leak on the ground is DEFINITELY coolant. Looks like coolant, smells like coolant, and water consistency like coolant. Don't think the previous owner used the coolant they're supposed to. We will see...
    Last edited by CrazyCal; 11-08-2011 at 01:33 AM.
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure

  15. #15
    Deactivated Four Rings
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    i have to say that it looks more like oil than coolant...

  16. #16
    Senior Member Four Rings Charles.waite's Avatar
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    Quote Originally Posted by CrazyCal View Post
    We will see when i tear into it. It's pretty green and oil ain't green. Maybe a mixture of the two since the breather hose has that crack. The leak on the ground is DEFINITELY coolant. Looks like coolant, smells like coolant, and water consistency like coolant. Don't think the previous owner used the coolant they're supposed to. We will see...
    Our coolant is pink, so yea it looks like the PO put in the wrong coolant. I know Porsche uses green coolant, but Audis (at least ours) use pink. I would get ready for a coolant flush!

    And I have to concur, it still looks like oil to me. when coolant leaks and dries on the block it gets this whitish reddish chunky consistency, kinda like someone blew chunks on your engine, not sticky dark oily like in that picture. Also given how the PCV system works, the oil blowby vapors go through that elbow tube and condense in the oil pan so a crack of that size would definitely allow enough oil vapors by to condense on that elbow (and likely all around the elbow too! yay!).

    Anyway, not trying to be argumentative of course. I dealt with that exact hose being cracked a few months ago so I know some of how the PCV system works now.
    -CP
    USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - 034 Rear Swaybar (Soft Setting) and Endlinks - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    2008 Black Unicorn (2.0t S-Line Ti 6MT Avant) - Bosch FR6KPP332S
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic stocker - Failing TC Mod

  17. #17
    Deactivated Four Rings
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    Quote Originally Posted by Charles.waite View Post
    Our coolant is pink, so yea it looks like the PO put in the wrong coolant. I know Porsche uses green coolant, but Audis (at least ours) use pink. I would get ready for a coolant flush!

    And I have to concur, it still looks like oil to me. when coolant leaks and dries on the block it gets this whitish reddish chunky consistency, kinda like someone blew chunks on your engine, not sticky dark oily like in that picture. Also given how the PCV system works, the oil blowby vapors go through that elbow tube and condense in the oil pan so a crack of that size would definitely allow enough oil vapors by to condense on that elbow (and likely all around the elbow too! yay!).

    Anyway, not trying to be argumentative of course. I dealt with that exact hose being cracked a few months ago so I know some of how the PCV system works now.
    true, when my rear coolant flange was leaking it was forming stalactites made of coolant residue...same shit started happening a few weeks ago with my thermostat...in both cases, the parts broke into peices when i removed them and i had to scrape the coolant hoses free of the part of the thermo that broke off inside of it...

  18. #18
    Senior Member Four Rings CrazyCal's Avatar
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    Quote Originally Posted by Charles.waite View Post
    Our coolant is pink, so yea it looks like the PO put in the wrong coolant. I know Porsche uses green coolant, but Audis (at least ours) use pink. I would get ready for a coolant flush!

    And I have to concur, it still looks like oil to me. when coolant leaks and dries on the block it gets this whitish reddish chunky consistency, kinda like someone blew chunks on your engine, not sticky dark oily like in that picture. Also given how the PCV system works, the oil blowby vapors go through that elbow tube and condense in the oil pan so a crack of that size would definitely allow enough oil vapors by to condense on that elbow (and likely all around the elbow too! yay!).

    Anyway, not trying to be argumentative of course. I dealt with that exact hose being cracked a few months ago so I know some of how the PCV system works now.
    No, not argumentative, just discussionary (is that even a word? lol). Like I said, we will see when I actually pull off the IM. Actually kind of looking forward to it. Will be my first time digging into the 1.8T. lol But, to me, it looks like the oil is mixing with the j-plug coolant leak, keeping it from drying up and leaving that white residue.

    Haven't heard back from 034 Motorsport about which kit I'm supposed to order (see post #9), but I can't wait. This needs to be done. It is my daily driver. I finally just decided to go with the Late-AMB version because it specifically lists 2004-2005 in the description. I'm just going to guess that the split is in the 2003 model year. Wish the website was more clear on that.
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure

  19. #19
    Senior Member Four Rings Charles.waite's Avatar
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    If you have this:


    Under your IM and connected to that cracked breather hose/elbow they you're late AMB. You're a 2004 so you SHOULD be a late AMB as I found out my car was. I was confused as hell with this stuff too. I just kept reading threads and finally it started to make sense. The VIN starts Chassis Code (8E =B6/B7 A4) - Model Year (2004 will just be 4, 2003 is 3, etc) - serial number (6 digit series). So a 2004 B6 A4 will always start 8E44xxxxxx or something like that. You can try out this VIN decoder and I should explain what everythign in your VIN stands for.

    So the correct 034 part should be THIS. I'll probably be picking one up for my '04 soon as well.

    I broke a few PCV parts a while back while replacing my Valve cover gasket. The VC gasket should have been an easy repair, but I ended up having to dig into the PCV system as well. It was literally the first repair I ever made on any car. It was fun, frustrating, rewarding, etc. Trial by fire definitely though! Good luck!
    -CP
    USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - 034 Rear Swaybar (Soft Setting) and Endlinks - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    2008 Black Unicorn (2.0t S-Line Ti 6MT Avant) - Bosch FR6KPP332S
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic stocker - Failing TC Mod

  20. #20
    Senior Member Four Rings CrazyCal's Avatar
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    Quote Originally Posted by Charles.waite View Post
    If you have this:


    Under your IM and connected to that cracked breather hose/elbow they you're late AMB. You're a 2004 so you SHOULD be a late AMB as I found out my car was. I was confused as hell with this stuff too. I just kept reading threads and finally it started to make sense. The VIN starts Chassis Code (8E =B6/B7 A4) - Model Year (2004 will just be 4, 2003 is 3, etc) - serial number (6 digit series). So a 2004 B6 A4 will always start 8E44xxxxxx or something like that. You can try out this VIN decoder and I should explain what everythign in your VIN stands for.

    So the correct 034 part should be THIS. I'll probably be picking one up for my '04 soon as well.

    I broke a few PCV parts a while back while replacing my Valve cover gasket. The VC gasket should have been an easy repair, but I ended up having to dig into the PCV system as well. It was literally the first repair I ever made on any car. It was fun, frustrating, rewarding, etc. Trial by fire definitely though! Good luck!

    Yep. That's what it looks like under the manifold. Good. So, I ordered the right part. Now, if installing was as easy as ordering...
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure

  21. #21
    Senior Member Four Rings Charles.waite's Avatar
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    Quote Originally Posted by CrazyCal View Post
    Yep. That's what it looks like under the manifold. Good. So, I ordered the right part. Now, if installing was as easy as ordering...
    Hah, preaching to the choir...
    -CP
    USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - 034 Rear Swaybar (Soft Setting) and Endlinks - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    2008 Black Unicorn (2.0t S-Line Ti 6MT Avant) - Bosch FR6KPP332S
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic stocker - Failing TC Mod

  22. #22
    Veteran Member Four Rings walky_talky20's Avatar
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    Quote Originally Posted by CrazyCal View Post
    I finally just decided to go with the Late-AMB version because it specifically lists 2004-2005 in the description. I'm just going to guess that the split is in the 2003 model year. Wish the website was more clear on that.
    Exactly. 8-3-500000 and up would include:

    - any 2003 cars after that split
    - and 2004 cars (8E-4-******)
    - and 2005 cars (8E-5-******)
    - obviously the above would all need to be 1.8T's, but you get the idea

    So your 2004 VIN would start with "8E-4", so that would put it mathematically "after" the 8-3-5000000 vin split. Indeed, your car certainly came after the 2003's on the production line as well! The split is basically saying "mid-2003 and up B6 1.8T's", but the specific numbers are there to determine what "mid" actually means in that context. In this case, serial number 500000 of the 2003 model year.

    It looks difficult, but the VIN split stuff is pretty simple once you get the hang of it. Good luck with the 034 kit. That kit came out just after I replaced my PCV stuff, otherwise I would have bought it in heartbeat.
    ^Don't listen to this guy, he's not even a mechanic.
    2001 Laser Red A4 1.8TQM, 5-Speed Swapped, APR 93, Splitter, electronic oil pressure gauge, B6 Sport 17's, ST Coilovers,
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  23. #23
    Senior Member Four Rings CrazyCal's Avatar
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    Thank you for the explaination. Helps reaffirm what originally made sense to me. The way they had it on the 034 website was listing 04-05 with higher than 8E-3-500000. Which makes no sense because 04s and 05s would be 8E-4 and 8E-5 respectively. Crazy. Hurt my head. lol
    ~Calvin
    2004 Audi A4 1.8T /// 6-Speed /// quattro /// Moro Blue Pearl
    || motoza tuned gt2871r elim || b7 thermal r&d exhaust || ns sport w/ b5 seats || v718 sunken treasure



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