Replace the Rear Coolant Flange and Heater Hoses on a 2004-2008 Audi A4 B7 2.0t FSI
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- เผยแพร่เมื่อ 9 ก.พ. 2025
- Brian Eslick from How to Automotive www.howtoautomo... takes you step-by-step through the process of replacing the rear coolant flange, heater hoses and temp sensor on a 2004-208 Audi A4 B7 with the 2.0 FSI engine.#HowtoAutomotive #AutomotiveRepair
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Affiliate link mentioned in the video for Audi A-4 2.0L (05-08) Coolant Flange + Seal GENUINE amzn.to/2uUijgo
Affiliate link mentioned in the video for Rein CHH0168P Heater Hose amzn.to/2LEvg7J
Affiliate link mentioned in the video for Heater Hose (Flange to Heater Core) Rein Automotive 8E1819371B Audi A4 Quattro amzn.to/2uXpuV1
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Affiliate link mentioned in the video for JSD 06F121057D Water Hose - Coolant Pipe to Thermostat fits 2005-2009 Audi A4 A4 Quattro 2.0L 4Cyl amzn.to/2NSyEsP
Affiliate link mentioned in the video for Audi Coolant Antifreeze Antigel Refrigerant (Part No. G013A8J1G) amzn.to/2LSmj7w
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Owing to factors beyond the control of How to Automotive/Brian Eslick, it cannot guarantee against unauthorized modification of this information, or improper use of this information. How to Automotive/Brian Eslick assumes no liability for property damage or injury incurred as a result of any information contained in this video. How to Automotive/Brian Eslick recommends safe practice when working with power tools, automotive lifts, lifting tools, jacks and jack stands, electrical equipment, blunt instruments, chemical lubricants, or any other tools or equipment seen or implied in this video. Because of factors beyond the control of How to Automotive/Brian Eslick, no information contained in this video shall express or imply warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or information contained in this video is the sole responsibility of the user and not How to Automotive/Brain Eslick. #howtoautomotive
This is a fantastic video!! I watched this before doing the repair on my car and did it exactly how you did in the video. Made this whole repair so smooth. I highly recommend this for anyone doing this repair on a B7 A4!
Dude thank you. You totally helped me out with taken the parts apart and back together. Great job and awesome work
This was a tough job-a lot of blind work in a tight space. Not to mention that my hoses were fused so hard to the pipes that even a pick wouldn’t free them. Took me about 5 hours and I couldn’t have done it without this video! I really appreciate the clear instructions.
I’m a Nissan tech but drive the good old Audi .. doing this job now .. not as bad as you would think but I’m also used to working blind and in tight spaces. Good tutorial 😀
I AM A DIY PERSON, DETAILED VIDEO , GOD BLESS YOU, KEEP UP THE GOOD WORK. THANK YOU
1:00 - Remove coolant level sensor and resovoir
1:27 - remove vacuum pump hose clamp, move out of way.
2:00 - move purge line out of way
2:23 - remove top coolant hose (T30 + 5mm bolt)
3:10 - remove vent line
3:40 - remove rear hose by cutting it off
4:17 - remove vacuum pump screws (T30)
8:00 - remove heater hoses at flange and firewall
11:30 - remove T30 bolts from flange and remove, carefully disconnecting sensor
12:00 - clean all mating surfaces
14:00 - install new flange, using old one to register sensor position
14:20 - reinstall new heater hoses through grommet and firewall
15:20 - install heater hose below purge valve
16:40 reinstall vacuum pump, making sure to attach ground bracket
17:40 reconnect wires
Those are some tight working quarters. Nice job with the video Brian, should be helpful to many people.
Ozzstar thank you Glen! It should be a helpful video. This is one of them pain in the but jobs.
Veteran mechanic but still enjoyed watching someone else do this, before I tried
Trying to fix neighbor’s A4 Turbo
Thanks for the part links
Dealer wants an arm and a leg for these parts
Wow, just wow. This was an amazing video! I've done the timing cover gasket which is around the same area of this car and I can't imagine how difficult it was to get some of those camera shots you made. I learned a lot from watching this video even after working in the same area. Bravo brother! This was a lot of work to put together and your style of shooting and explaining is very easy to learn from. Fantastic job!!
This is a great video and exactly what I need to do to our car. The dealership quoted me a little over $1,200. Instead I spent about $170 on parts and planning to do this in the next few days. Thanks for sharing your knowledge.
Nobody goes to a dealership for fixes, everybody with a brain knows that 💀 they mark up everything by hundreds of dollars
@@SouthTexasCollectibles23 helps increase resale value for cars you don't plan on building or keeping
I was a little discouraged about doing this job,,,but thanks to you, I think I can! Thanks for the details
Duke Estes it’s definitely a doable job specially if you have small hands. You will save a bunch of money.
They quoted $250 in labor, and the parts were double the ones you listed, plus I have Amazon prime, thanks for listing the parts. My hoses did have the part numbers so I used then also to assure myself...looking forward to doing this job, for some reason I get excited working on German cars...p.s I also bought a very expensive gasket kit(3 o rings for $35) for the vacuum pump, I noticed the port sweating oil...any advice on that, im hoping that cures the check engine large vacuum leak code if not go to the n80 valve.
Mine just went out, they quoted me 690usd parts & labor 🤒🤒
Excellent tip with the napkin piece to hold bolt to bit! Thanks for the thorough video
A good tip is to buy a couple extra bolts for the coolant flange, just in case. They sell them at ECS Tuning for $3.99. It’s such a tight squeeze back there that it’s easy to lose hold of it. I did this job eight years ago (and now need to do it again) and the spare bolts saved me. I dropped one of the original bolts and never saw it again. Couldn’t find it anywhere in the engine bay or on the ground. Having a spare allowed me to press onward without having to order another and wait days for it to arrive.
Did mine today and this video is very helpful, also found that previous owner had someone worked on it and the grounding bracket was not put back to vaccum pump, had to make sure to get that back in place.
Thank you!!! The only thing I have ever done to a car is change the brake pads and spark plugs but never worked on anything else and this video helped me change the coolant flange and hoses on my audi with no problems.
Great DIY video, it always makes it easier when you see how it’s done!
Video was very helpful. A few months ago, I replace the vacuum pump...that was easy compared to replacing this coolant flange. Yes, I cut the hose, but that tiny razor blade was really inadequate and getting the hose remnant off the pipe was a real pain. I removed the pipe to get the pipe clean. This took too much time... I should have paid someone to do this, I kept dropping parts! Thanks again for the video, I'm up and running again, without issues.
Excellent demonstration. The small ratcheting drive is almost essential so buy one before you start. Note that the short hose between the flange and top rail has different sized ends so you can use a standard cooling system hose.
Thanks for posting.
I followed the video step by step and I was able to replace the coolant flange with no issues.
Nice glad the video was helpful. Thank you for watching!
@@HowtoAutomotive this is nice video, about a short hose connect to coolant flange that you cut before remove the flange, is it easer to install this short hose to the flange before you install the flange to cylinder head? is it right? Thanks
Excellent clear description of the process
Amazing depth and very educational
Thank you
Awesome bro step-by-step now I feel like a Mechanic
Thank you! Helped me with my 2007 A4.
You definitely know your stuff! Best how to videos on TH-cam.
Sakeenah Auto Solutions thank you!
Thanks so much for your help! I pulled out the high pressure fuel pump (have you checked your cam follower lately?), the variable timing solenoid valve and the annoying bracket next to it, and the battery for more room around the heater hoses. I couldn't get the upper heater hose off the quick connect so I ended up just cutting it short, leaving the grommet in place and fishing the lower hose up through the grommet. The upper hose is plenty long so if yours is in good shape you might just want to do this instead of buying a new one. It's not that bad a job, just a long slog with all the prep work taking things off to make room, and a lot of reaching and hanging over the engine. T30 mostly some T25, triple square for the annoying bracket, 6mm allen and 10mm hex for the battery and vent, 4mm allen for the fuel line. I think that's it. "needle nose" vice grips for the many hose clips, big and small slots, knife, etc for pulling off hoses.
Oh, and the short hose and one of the old heater core hoses makes a quick tool to blow coolant from the reservoir cap hole into the engine for priming!
EDIT: oh, I didn't cut the short hose either. It came off the cross over pipe pretty easily, and there's just enough give in the pipe to push the short hose off employing a screwdriver without disconnecting the other hose.. I gave it a shot of silicone and worked it in there first. Not the the heater core hoses: cutting them is definitely the way to go.
Fantastic video! Wouldn’t have gotten through this job without it!
Outstanding video!... This is a tough job from an access point and your experienced methodical approach is excellent... great narration and very good footage showing every detail... I thank you and am new heading into my garage to do this job and save about $600
Glad to hear the video will help you and save $600 that’s awesome! Thank you for watching!
when i heard "you don't have to have a tool like this" ...my brain automatically added "but it helps"...if you've seen the that guys vid, you know what I'm talking about lol
Please view part number flange and heater hose
Excellent video very thorough
You make it look so easy. Great video 👏 👍
thank god for this video man ... this really Is a hard job for sure.
This was incredibly helpfully. Thanks for the great write up!! - One thing, at the time I came across this the part linked for the Coolant Flange Hose is incorrect (the one that was cut in half). The correct part number is 06D121101B.
Thank you
What is that part that you have your hand on at the 12:22 mark. The black things in the white packaging to the left of the houses. I don't see this listed in the list of parts and I didn't hear the name in the video.
Thank you for the video! My rear coolant flange has a small leak.
This video saved me
Hi there can u point out wea the ground wire is in the engine bay of this model pls cheers
Excellent video. I ended up having to cut the upper hose too. Even cutting it off was very tough. I swear they glued them on. Thanks for being so thorough in your narration.
Glad the video helped. Thank you for watching!
I replaced the cooling flange a few years ago using Alldata DIY. Your video and commentary would have been helpful.
Later I pulled the head to change the gasket and get some valce work done. And was back there pulling the vacuum pump again.
When I swapped my clutch earlier this year, I saw just how swollen the hoses are and need to replace them. Next job on the car. Darnit, anyway. It's a tight spot. I think I'm going to get that ratchet you used.
Thanks for the vid.
Very good video, very clear
Love your video on this coolant flange replacement ! VERY detailed !
Tho I really appreciate the instructions remind me to not work on an Audi if I can avoid it lol side note hoses are fused to everything makes it difficult
I did this on my 1.8t before I had the 2.0t...and the 2.0t is 100xs more frustrating. Those spring band clips on the hard pipe hose got me and I didn't order one ahead of time. Would 100% pay a shop to do it for me next time. Hahaha Thanks tho.
Anicrow I know what you mean it’s a pain in the ass. But you still save some serious money.
I'm gonna be stuck taking my car to some one anyways cause the connector for my coolant sensor rotted from the leak. Been a fun day with the A4. This is supposed to be easier than my 2.7t lol!
Thank-you so much. Got all the parts and attempting it tomorrow.
How did it go?
Thanks for this GREAT VIDEO!! This has helped me tremendously!
My audi didn't have a back there when I toke the vacum pump off do I need to get one
Can’t thank you enough. 🙏🏽
Thank you for watching!!
I've never filled the cooling system that way, instead, clamp off the little line to the reservoir remove the 10mm plug on the cross pipe and burp the system by placing a wet finger over the hole on the cross pipe, lifting as I squeeze the large hose on the reservoir and placing it over the hole as I release. This pumps out all the excess air up high in this closed cooling system. You are done when coolant without bubbles comes out of the port. Reinstall the plug.
Have you ever done one on a 2012 A8L Quattro ? I have a leak and cannot find it.
hey man does the heater hose that connects to the coolant flange have an O ring?
I’m having the same problem, do you have a mechanics shop and where?
Could you update the list when you get a chance? Some of the items are unavailable
You weren't kidding about the hoses liking to stick to the metal coolant pipe lol they were basically demonically possesed! But job done and your video was super helpful. Thanks Champ.
Hey yall. I have a problem with the coolant temperature sensor wiring. Theres a open circuit so im trying to follow that hose with the harness on to guide me to do a saulter on my new connection wire. Do yall have any idea where it leads to? I can see the wires but its so tight back there i cant seem to pull it out. Pls help.
Great video.
I’ve done the vacuum pump rebuild previously and that was a bear. Housing needs to be replaced now roughly 20k later. Looks like a lot of shop time to get this done.
God damn, so is coolant disappearing but leaving no puddle a symptom for this replacement? Coolant constantly draining from reservoir bit no puddle when parked
Great video rookie error on my part I’ve been left with a T30 bolt 🤦🏻♂️😆 I have no idea where it came from lol I’ve got the 3 bolts back in the vac pump and I have the 2 back in the flange lol
I can’t find part numbers or names of parts so I can find them all including everything you replaced?
Can't find any of the hoses you have listed, Says the page doesnt exist. Having a hard time tracking them down
Omg , where are you located?
What is the reason to replace the coolant flange?
Great jobs, very good video and manual.But I think self-locking clamp better than ordinary for screwdriver. I would left original ,self-locking.Thank you for you job.
Hectic job. Thanks for the vid
Just did this job lol. Wish Audi would give us a removable access panel by the battery compartment/firewall
Great video, about to try this project. Quick question do you have to flush all the coolant out before starting?
I did it everybody!!!!
That brake part(new) was already oily . I didn’t “oil” the gasket ring. Was that ok? Didn’t have oil with me
Thank you for this video fr
hi how to autootive,
The part number 8E1819373R, corresponds to the two hose together or do you have to buy two of those separately?
Hi! I have the exact same car and engine and need to replace all this parts that was replaced in the video such as the coolent hoses and temp sensor with the nescesary o rings, etc.
And Wonder if the video maker or someone make the list for me for all this parts that was replaced in this video and link it to me or confirm My list here off the part numbers and parts i got and see if i got everything i need or not?
I appreciate asap Answer and help as i need to order all this parts asap as well
Quick question. When your burping the coolant tank why set the blower speed on low? I’ve always set it on high with the heater on. Does it help draw air out of the system better?
great help thanks
kajak7 thank you for watching!
How much coolant came out of the hose when you cut it, what type of bucket do we need underneath? (I.e. Tons of fluid, medium fluid or a little fluid) Also, we should do this when the car is cold and has sat right?
i had to stop and put everything back as I couldn't remove the stupid hose off and didn't have a triple square 5 mm bit, I just ordered one as well as the coolant hose clamp plier. It's pretty tight.
Yes it’s tight back there. Hopefully it all works out for you. Thank you for watching!
What can I get to take the bolt that is striped and can, t get it out
Is ,t on the flange
So do you do house visits I'll learn a lot better in person
Excellent how-to video! Kudos to you for doing this! Can you please let me know: Is this the same as, or very close to, the A4 B6? I believe I've got this exact issue on an A4 B6 2003 Quattro 1.8 turbo petrol.
you could rename this video "how to replace the vaccum pump and coolant flange on Audi a4 B7". there are no good videos expaining the vaccum pump removal on A4 quattro like you.
Thank you for this video. It has helped me understand and locate my issue and part. I need to replace the heater hose on the flange ( the one with the quick disconnect). Is it possible to pull just that hose through the grommet or do I need to remove everything like you have done in this video? Also, do I need to drain all the coolant do do this one hose?
You should be able to just replace just the one hose.
*what will happen if that metal bracket doesnt get bolted back in place let's say it hangs loosely with the wires attached to it? Asking because mine is currently in that state and it may or may not be causing an issue I'm having so just wanted to know*
What if installing the coolant flange continues leaking? Mine seems to be leaking from the top of the heater hoes any advice on what it could be?
10:11 these pipes that the hoses connect to are deteriorated, how do I go about replacing these?
Is the flange housing bolt a torx or a triple square bolt?
Torx
nice vid very professional, but i still dont want to do it ! ha ha . you have to wonder what the hell engineers are thinking sometimes !
I've got an audi a3 2.0 tdi (I know diesel cars aren't popular in US) you still may help me, so the question is, if I want to replace the flange do I need to flush out all the coolant? It will drain anyway if I pull out the part? Or how it's work. Thanks
Sergiu C only if it has a lot of miles on it I would.
@@HowtoAutomotive 103k miles is it enough? :)
Awesome video, thank you.
blueaudi8275 thank you for watching!
Milwaukee's new tools are for sure coming September everywhere ? I wanna save my money
nipplemilk Network yes they will be out in September!! I’ll be doing reviews on the channel so stay turned for that.
How to Automotive you bet , only place to go for reviews
2:23, I'm missing that screw that holds the hose down.. what is that screw called and what size and where can I get it? thank you for your help
Zip tie that bitch
Hello. I have a question if the vacuum pump is leaking oil would that be a possible cause for turbo underboost condition
No. It only feeds the brake booster
No, the vacuum pump operates the brake system primarily.
My car is nocking and is leaking coolant any suggestions??
is it ok not to bleed the heater core and cooling system?
Hello I have a 2000 Audi A6 Quattro and I’m having coolant leak issue that caused my car to over heat. The leak is toward the back of the engine/transmission and not the reservoir. Does this mean I need to replace the heating core hose?
K Burn1 Most likely not heater core. On the back of the cylinder head there’s a coolant flanges where the heater hoses go to that is probably the leak. It’s probably leaking because of an oil leak that caused the leak to look into that also.
What for hose is at 21:41? Thanks
Just did this and the video is great (though as noted one hose is incorrect and another is missing from the list) Previously I rebuilt the Vacuum pump and replaced the rear timing chain and tensioner, I looked at the flange and hoses and they were fine (no leaks/swelling) Sure enough three months later it started leaking! As others have noted the hoses tend to 'weld' themselves to the steel pipes so just cut them as getting the clamps off is a bitch, the only tool I wish I had was the remote style of clamp compressor (the one with a long cable ) as getting at them is a bigger bitch LOL.
I'd have a hard time reaching those fasteners and clamps but you made it look somewhat easy. What kind of camera do you use to view around corners? It's amazing that you showed the screw at the back of the head with it. Also, where can I get quality German style house clamps? The ones I tried fell apart when tightened. Thanks for another great video.
Geo Logic I’m using a IPhone 8 to get back there. You use the screen as a viewfinder so you can see what your filming. For the clamps I get them from Worldpac.
Lol I can't do this 😭
Yes you can!
@@midnightboymcsince we are all commenting every 2 years I’ll comment. I just did this….I lost the retaining clip on the heater hose, I broke the vent hose, some wire is exposed on one of the coolant hoses cuz blah whatever. So $40 for the flange housing thing, $10 or something for the clip, $15 for the breather hose I shouldn’t have broke, $25 for the triple square bit set. And hopefully nothing else….I really hope there’s no plastic shrapnel in the hoses now cuz that’s why I’m changing the flange thing. It broke.
@@Mike-we3rbsame, it just blew apart randomly when I was parked with car running
@@Mike-we3rbI also broke tf out of the breather hose, he said he careful these break a lot, paused it then proceeded to snap it in half
@@pwindThose breather hoses are pretty brittle as they get older, that’s for sure. Especially if you’re doing this job in cold temperatures.
Do you have a list of part numbers for this job? Thanks
There are affiliate links for them in the description of the video.
What does a job like that cost
Damn replaced my coolant flange its still leaking. So either i messed up and didn't get it in right, or its a bad part or my timing cover is leaking coolant I hope its 1 of the first 2 lol
whats the flag time for this job
They sell an aluminum flange that is a much better option. I just got mine on Amazon for about $14
Also, I use a tiny bit of lithium grease on the orings and have never had a problem in 20 years of wrenching. I would also recommend replacing the bolts with 10mm heads. I almost couldn’t get one of the oe bolts out because it rounded. I barely got it out with an Allen socket.
Good job but the audi a4 is a nightmare to fix them no room to work engeneers for got the mechanic this cars will never brake 👍