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- coolant leak at back of motor.
03-07-2010 03:53 PM #1
Active Member Two Rings
coolant leak at back of motor.
I have a coolant leak on the back of the motor. I have had this done before but that was before i worked on my own car and i don't know what part it is that i need to order. I am pretty sure that it is a temperature sensor housing but if anybody could tell me what it is for sure it would be great
thanks in advance
03-07-2010 03:57 PM #2
Veteran Member Four Rings
Rear coolant flange.
There should be a coilpack/coolant flange sticky at the top of this forum. They fail about every 10 minutes.
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03-07-2010 03:58 PM #3
Veteran Member Three Rings
You need the Coolant Flange. Its 27 bucks from the dealer. Just had mine replaced a month ago because its a pain in the butt to do yourself, IMO
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Proud of my pink coolant.03-09-2010 08:26 AM #4
Veteran Member Three Rings
Having just done the flange on my car only to have it still leaking, I would also make sure and check the heater hose that comes out of the bottom of the flange. It is hard plastic and held with a metal clip. I am still waiting on the parts, but it went back together very "loosely" and I had no confidence that my problem was solved. About 1 minute after I started the car...drip, drip, drip, drip, drip. I dried everything up really well started the car again and there was coolant on the hose and not on the back of the block.
03-09-2010 08:32 AM #5
Established Member Two Rings
Had the same issue with my car. It ended up being the coolant flange as well. Agree with Gray6spd PITA to change especially in the middle of winter when mine went out. Decided to have the dealer do it since working outside with no real tools made the decision easy for me.
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03-09-2010 08:53 AM #6
Forum Moderator Four Rings
Did mine a few weeks ago after I messed mine up fitting a coolant switch, all I can say is that it took me all weekend and having to work blind for most of it has you can not see what your doing for the key part of undoing the coolant bolts which it has two lots on each thread.
If you have the money get a shop to do it if not I wish you luck and do it at the weekend oh and get a small mirror and I pray you have small hands.
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03-09-2010 10:29 AM #7
Veteran Member Four Rings
I've replaced two . . . the second time through gets easier having done it before. The first time was a pain though. Just takes time and using your fingers without being able to see what you're working on.
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Got Vag-Com?03-09-2010 10:31 AM #8
Veteran Member Four Rings
he's got an S4. does the V8 have the same coolant flange problem? I know the 3.0s dont.
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03-11-2010 07:34 AM #9
Active Member Two Rings
hey thanks guys im going to get the part today. does anybody know if there is a DIY for this. i guess im going to attempt to dothis my self.
03-11-2010 07:42 AM #10
Active Member Two Rings
Originally Posted by zz2h33he's got an S4. does the V8 have the same coolant flange problem? I know the 3.0s dont.
i do still have my S4 but if you look up the thread S4 bites the dust youll see what happened to it. I bought a 2003 A4 1.8t to drive while i put the old girl back together
03-11-2010 07:53 AM #11
Veteran Member Three Rings
Originally Posted by lyleswkHaving just done the flange on my car only to have it still leaking, I would also make sure and check the heater hose that comes out of the bottom of the flange. It is hard plastic and held with a metal clip. I am still waiting on the parts, but it went back together very "loosely" and I had no confidence that my problem was solved. About 1 minute after I started the car...drip, drip, drip, drip, drip. I dried everything up really well started the car again and there was coolant on the hose and not on the back of the block.
Let me know if the hose fixes it, I've got the exact same problem with having just replaced the flange and it still leaks. How likely you think it is to be the head gasket?
If you're going to do the flange make sure you don't cut corners and remove the airbox completely, that's a huge help. Also all the wiring for the coils pull that back and the hard black metal lines that run from the front to the back of the motor need to be loosened. Took me 8 hours. If you pull yours off and there is not rust or disfigurement on around the rubber gasket then you my friend are effed in the a, it'll still prob leak after you put a new one on :(
03-11-2010 08:12 AM #12
Established Member Two Rings
Coolant block plug?? That's what happened to my car, could be a possibility.
03-11-2010 11:21 AM #13
Veteran Member Four Rings
I found the same problem on my car. I can see the coolant leak on the back of the engine but when changing my oil I saw some pink gummy looking stuff on my dipstick so I believe I have both a cracked flange and a head gasket to do. I would suggest checking your oil dipstick to see if you find any whiteish/pinkish stuff on it. If so then you're in the same boat as me. Good luck!
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03-11-2010 11:52 AM #14
Veteran Member Three Rings
Originally Posted by CasiusLet me know if the hose fixes it, I've got the exact same problem with having just replaced the flange and it still leaks. How likely you think it is to be the head gasket?
If you're going to do the flange make sure you don't cut corners and remove the airbox completely, that's a huge help. Also all the wiring for the coils pull that back and the hard black metal lines that run from the front to the back of the motor need to be loosened. Took me 8 hours. If you pull yours off and there is not rust or disfigurement on around the rubber gasket then you my friend are effed in the a, it'll still prob leak after you put a new one on :(
Got the hose from the dealer ($60, ouch, but wasn't willing to wait) last night, replaced it and so far, no leak. I think the part that really goes bad is the metal clip that gets "sprung" becuase when I compared how loose the old one was and how tight the new one was, I was about 90% sure I had my culprit. Oh, and I was able to do it by reaching around both sides of the engine (right arm by intake, left arm over turbo) and peering down from above (3 legged PVC line removed) without much difficulty. This may not work if you have big arms. Anyway, add the heater hose clip to the what to pay attention to when doing the rear coolant flange job. As I said above, had I thought about drying everthing up and really sourcing the leak vice just going with what is normal, I probably would not have had to replace the flange as the o-ring and lip looked good on my flange.
03-11-2010 11:53 AM #15
Veteran Member Three Rings
Originally Posted by 05silvera4Coolant block plug?? That's what happened to my car, could be a possibility.
I think this is actually on the side near the thermostat. Anyone know differently?
03-11-2010 02:34 PM #16
Veteran Member Three Rings
Originally Posted by lyleswkGot the hose from the dealer ($60, ouch, but wasn't willing to wait) last night, replaced it and so far, no leak. I think the part that really goes bad is the metal clip that gets "sprung" becuase when I compared how loose the old one was and how tight the new one was, I was about 90% sure I had my culprit. Oh, and I was able to do it by reaching around both sides of the engine (right arm by intake, left arm over turbo) and peering down from above (3 legged PVC line removed) without much difficulty. This may not work if you have big arms. Anyway, add the heater hose clip to the what to pay attention to when doing the rear coolant flange job. As I said above, had I thought about drying everthing up and really sourcing the leak vice just going with what is normal, I probably would not have had to replace the flange as the o-ring and lip looked good on my flange.
Exactly, I pulled my flange off looked at it and said god damn it... I knew it wasn't the culprit right away, and I was very curious about that hose myself, it was indeed quite loose.
Any name or PN for that hose by any chance?
03-11-2010 03:11 PM #17
Veteran Member Three Rings
Feed hose in the link below. Like I said, I got mine for $60 from the dealer and it took 2 days.
//www.ecstuning.com/Audi-B6_A4-...h/Heater_Hose/
03-12-2010 07:33 AM #18
Active Member Two Rings
Originally Posted by CasiusLet me know if the hose fixes it, I've got the exact same problem with having just replaced the flange and it still leaks. How likely you think it is to be the head gasket?
If you're going to do the flange make sure you don't cut corners and remove the airbox completely, that's a huge help. Also all the wiring for the coils pull that back and the hard black metal lines that run from the front to the back of the motor need to be loosened. Took me 8 hours. If you pull yours off and there is not rust or disfigurement on around the rubber gasket then you my friend are effed in the a, it'll still prob leak after you put a new one on :(
looks like its going to be a weenkend job. thanks for the heads up on all the tricks to make it easier. and im hoping that the rubber gasket looks bad. if not ill be right back here asking what in the he!! do i do now .
03-12-2010 08:15 AM #19
Veteran Member Three Rings
I'm leaning towards either the rubber seal in the heater hose or head gasket. Ironically head gasket is probably easier than the hose haha
03-12-2010 08:17 AM #20
Veteran Member Three Rings
Originally Posted by lyleswkThanks. I talked to the parts guy, he said it might just be the rubber seal inside that connection.
By the way, how long did replacing that hose take?03-12-2010 10:12 AM #21
Veteran Member Three Rings
30 minutes?
3 hints: 1) Be very careful with the spring clip not to drop. Finding it would be a pain. Also, keep the old clip and just dry fit it a few times to see how "loose" it is.
2) practice fit the new spring clip with the hose off the car. You will be "blind" fitting the clip, so mentally get what it looks like.
3) I got the clip installed to the mid point (look at your hose when you get it and you will see what I am talkling about) and then used a short flat head to carefully and gently pop it into the final seated position. Don't pry it off and have it go flying to an unknown location!As I said above, all you have to do is remove the 3 legged PCV hose (I know, not the right name) and then you can reach the flange / hose connection by "hugging" the engine and peering down where the 3 legged PVC hose was.
P.S. There isn't a rubber anything at the connection. It is hard plastic to hard plastic with only the spring clip holding it in place. Not sure why it is designed that way, but that is what the pictures at the dealer confirmed as well...unless it is integral to the hose and I didn't notice it...
03-12-2010 04:37 PM #22
Active Member Two Rings
Originally Posted by blackopsHad the same issue with my car. It ended up being the coolant flange as well. Agree with Gray6spd PITA to change especially in the middle of winter when mine went out. Decided to have the dealer do it since working outside with no real tools made the decision easy for me.
hey blackops how much did it cost you to get that done? im sure i have the same issue after reading many posters having a coolant leak and stating it was the flange. i had a coolant flush done by audi a few months ago, so i really dont want to spend a thousand bux for them to put in a $30 part lol..thanks in advance
03-15-2010 10:10 AM #23
Veteran Member Three Rings
Just curious if Crack or casius got your leak solved and what it was...just for learning sake...
03-16-2010 09:34 AM #24
Active Member Two Rings
im elbows deep in it right now........and its looking like ill be here for a while. and im doing a valve cover gasket at the same time.
03-17-2010 10:21 AM #25
Active Member Two Rings
coolant leak is fixed i replaced the coolant flange, the coolant tempsensor and o-ring,and the heater hose o-ring. and got rid of all those cheap hose clamps. took me about five hours with valve cover gasket
04-21-2010 01:13 PM #26
Veteran Member Two Rings
had a slow leak since i was at 70k or so but i haven't driven the car as much so i waited. couple of weeks, and leak is getting aggresive and i now have to top off almost once a week so i called a new indi shop. $450 parts and labor is the quote. i guess it's do-able expecially since its still kinda raining on and off here. sounds like money well spent if you guys are quoting more than a few hours--if not days to get it done manually.
11-10-2015 10:17 AM #27
Active Member Two Rings
Originally Posted by lyleswkI think this is actually on the side near the thermostat. Anyone know differently?
It makes sense that you are talking about "J-Plug" and that is right next to the thermostat under the intake manifold
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11-10-2015 11:54 AM #28
Veteran Member Four Rings
Originally Posted by 2300jakeIt makes sense that you are talking about "J-Plug" and that is right next to the thermostat under the intake manifold
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he probably figured it out 5 years ago...
Never argue with an idiot, they'll bring you down to their level and beat you with experience.
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New Build In progress built 2.7 STK 2004 B6 A4- Thread and pic to come11-11-2015 05:38 AM #29
Active Member Two Rings
Originally Posted by blitz2190he probably figured it out 5 years ago...
Too funny. You're not wrong.
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