MK4 VW 1.8t Coolant Pipe/Hardline Replacement

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In this Steve's Garage video I replace the coolant pipe (hardline) on a MK4 VW 1.8t. The coolant hard pipe is not really a maintenance item, I'm replacing it today because I was diagnosing a coolant leak and wanted to cover my bases while I had the car taken apart. I also noticed the coolant hard pipe itself was quite crusty after 20 years of salty winters, so I thought I would replace it. This video should work for any 99-05 MK4 VW with the 1.8t. If you notice any discrepancies between this video and what you;re working on, leave a comment! I'd love to know your experience.
If you're interested in replacing the thermostat and housing on a MK4 1.8t, check out my other video here - • MK4 VW 1.8t Thermostat...
The coolant hard pipe on a MK4 1.8t runs from the thermostat area, around the engine and ultimately connects to one of the heater core hoses. There are a couple other junctions that feed various parts of the cooling system. Though the coolant hard pipe is not something that commonly fails, it is a vital part of the cooling system on a VW 1.8t.
The part number for a MK4 1.8t coolant hardline is 06A121065AK. I bought mine from ‪@UroTuningOfficial‬. I'm not sponsored or supported by them in any way, just a happy repeat customer of theirs.
As always, I assume no responsibility for any damage while working on your car. This is a how-to video, but is not a replacement for knowledge and experience working on cars. If you have any questions, please leave a comment. Thanks for watching!
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Chapters:
0:00 - Intro
0:29 - Diagnosing a Coolant Leak VW 1.8t
1:00 - Draining Coolant MK4 1.8t
1:18 - Tools You'll Need to Replace MK4 1.8t Coolant Hardline
1:40 - Removing Parts To Access The 1.8t Coolant Hardline
2:50 - 1.8t Coolant Hardline Bolt Locations
3:17 - 1.8t Coolant Hardpipe Attached Hoses
4:03 - Removing Oil Filter Feed Line and Electric Plug 1.8t
5:04 - Removing Coolant Hardline MK4 VW 1.8t
5:35 - MK4 VW 1.8t Heater Core Hoses
5:50 - Installing Coolant Hardline MK4 VW 1.8t
7:21 - Installing Oil Cooler Hoses MK4 1.8t
8:08 - Installing Hose From Coolant Temp Sensor to Coolant Hardline
8:41 - Installing Heater Core Hose To Coolant Hardline
8:59 - Installing Coolant Return Hose to Coolant Hardline
9:21 - Installing All the Other Parts You Removed
9:46 - After Coolant Hardline Install/ Bleeding Cooling System
10:16 - Outro

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Опубликовано:

24 июл 2024

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Комментарии : 49

@TwinSummrs Год назад

Lifesaver man thanks so much for this video

@StevesGarage Год назад

Glad it helped! It's a weird part to get at, and there's not a lot of info out there.

@Brinkz1.8t20v Год назад

Same I’m glad this vid exists cause I’ve tried searching everywhere for this one specific pipe, now I can get back to work thank u

@StevesGarage Год назад

@@Brinkz1.8t20v This video has already been much more helpful for people than I expected it to be. Glad you found it useful and thanks for the comment!

@hallcraft Год назад

nice work, I have to do this now too...

@StevesGarage Год назад

Thanks! Definitely worth tackling as a preventative thing before it fails and you're stuck waiting for the part to arrive.

@ostroand3722 10 месяцев назад

thanks for English subs!

@ostroand3722 10 месяцев назад

I have a hole in this pipe, i have tried to fix it without replacement and buy glue, which is called "K2 metal repair", but it has screw up in 3 days😆

@StevesGarage 10 месяцев назад

@@ostroand3722 Yea... I don't put much stock in products like that. Especially something like the cooling system that is hot and under pressure. Time for a full replacement!

@user-fe9kl2su9o Год назад

Hi Steve, very helfull. Once you get those bolts out that are holding the hard pipe...do you just pull out the hard pipe to come out of the hole next to the thermostat, wiggle it or what and to install it back you just push it into the hole?

@StevesGarage Год назад

You should be able to pull it right out, though if you have a lot of corrosion like I did you might need a big screwdriver or pry bar to pop it loose. As far as installation goes it popped right into place without issue. If you're having trouble getting it in you could use some coolant to sort of lube up the o-ring.

@nddavi58 2 месяца назад

this looks like an absolute nightmare

@StevesGarage 2 месяца назад

Honestly, I've done worse jobs, mostly on my Volvo 😅. It's pretty involved to get in there, but it's mostly just removing a bunch of hoses and lines to access the hard pipe.

@maxstinehour6662 5 месяцев назад

Great video! Happy to see quality 1.8t content still coming out. I'm attaching my coolant pipe now and can't align all the bolt holes. Is there any kind of spacer on any of the bolts? The bolt just to the top right of the oil cooler isn't even close and this is the pipe that came off the car...

@StevesGarage 5 месяцев назад

I'm glad people are still finding it useful! From what I remember there isn't a spacer of any kind, just the bolts into each location. I know the bolt in that location also has the bracket, and a few other holes around it for that electrical connection. Is it possible the pipe isn't seated correctly or you're trying to attach it to the wrong place?

@maxstinehour6662 5 месяцев назад

@@StevesGarage pipe and or bracket is bent. Bryn gave me a heads up on that one. I have about another hour or two of tiny bends as it is still not sitting right where the pipe seals to the block.

@StevesGarage 5 месяцев назад

@@maxstinehour6662 hmm I wonder if it's worth buying a new one? Guaranteed to fit then!

@maxstinehour6662 5 месяцев назад

I wish. Part no longer made. 06A121065AG is the park and I might try to make 06A121065AK work.... we'll see. At least my link ecu and g25-550 are simple. Thwarted by a coolant pipe.....lol. #carsarepain.

@StevesGarage 5 месяцев назад

@@maxstinehour6662 It's always the simplest things right? I can't believe they stopped making it! I don't know anything about the newer 1.8t, but I wonder if it has a similar part 🤔 I guess worst case scenario you could always cut out the center section of the pipe and replace it with heater hose. Not the best, but might be needed if they don't make the part anymore.

@jreynoso8988 9 месяцев назад

I’m having trouble getting the line to actually seat fully, I have the correct o ring but I do not have a bolt for the front hole, will that cause problems?

@StevesGarage 8 месяцев назад

For something like this I'd be weary to not have all the hardware to hold it in place. The pipe slides into the block and as far as I can tell is only held in place with the bolts and sealed by the o-ring. I don't know the size of the bolt, but I'm sure it's something common you could pick up from a local hardware store. I'd assume it's the same as the others that hold it.

@user-eo6zb7pc3u 4 месяца назад

How do you get that big clip on in front of the coolant hard pipe?

@StevesGarage 4 месяца назад

Are you talking about the c-clip for the PCV hose? It can be a pain, but you have a make sure the PCV hose is properly seated, and then push it in with a pair of pliers or something.

@josephtrad7560 7 месяцев назад

There is a connection with 4 thin lines cooling pipes in golf4 2,0. Please tel me about it?

@StevesGarage 7 месяцев назад

I haven't worked on a 2.0, so I'm not sure. Sorry. Is it possible to find the part diagram online?

@jasonsantos5931 8 месяцев назад

Do you have to remove thermostat before removing the hard pipe mine is stuck all bolts are out hoses out and wires out the way

@StevesGarage 8 месяцев назад

You shouldn't need to. I know I didn't have to. My pipe was stuck in there enough that I had to use a pry bar to pop it out. Could be the same case for yours.

@ayo_edwin_check Год назад

Recently bought a cheap 99 2.0, is this the same process as the 1.8t?

@StevesGarage Год назад

I don't have a lot of experience with the 2.0, but I believe it would be a similar process. The pipe is different, but the idea is the same as far as how it runs around the engine. It would also probably be easier on the 2.0 since there's not as much stuff in the way.

@polar7075 11 месяцев назад

Just wondering I’m doing a full engine swap that hose that comes out the t junction next to the thermostat where does that connect to

@StevesGarage 11 месяцев назад

It runs up to the Y junction that's next to the power steering fluid reservoir.

@polar7075 11 месяцев назад

@@StevesGarage what does it connect to though it doesn’t connect to the coolant reservoir does it

@StevesGarage 11 месяцев назад

@@polar7075 One split of the Y goes to the coolant ball, the other connects to a hard line that runs to the turbo.

@brianverrochio5359 Год назад

Is there any o ring that goes on the end of the hardline that goes into where the thermostat is kept

@StevesGarage Год назад

Yup! There's a small o-ring on there that comes with the hardline if you order a new one. I don't know the part number for just the ring as I never looked into it. If that's what you're after, I'm sure you could buy just a replacement o-ring. It'll be much cheaper than a whole new hard line!

@brianverrochio5359 Год назад

What is the first bolt on the front of the block, I’m trying to do this and I’m so lost with the bolts

@StevesGarage Год назад

@@brianverrochio5359 Follow the pipe to right before it bends around the block, the bolt is on the underside of the pipe.

@lancewatanabe5825 Год назад

Did you buy the genuine vw OEM metal hard pipe that's $170 from urotuning? Or did you buy aftermarket mtc brand? Price difference is huge is why I'm asking! Thank you in advance!

@StevesGarage Год назад

@Lance Watanabe I went with the OEM hardpipe. I've had a bad experience with non-oem coolant hoses leaking right out of the box, so for this pipe I didn't want to take my chances. I couldn't find anyone with a review of sorts for either brand, but the OEM one lasted 20 years, and I'm not sure even actually failed. The price difference is huge, but being a part that's so buried in there I didn't want to take a chance.

@lancewatanabe5825 Год назад

@@StevesGarage thanks for replying! I'll bite the bullet and go genuine OEM. Great job on the content! Much appreciated!

@StevesGarage Год назад

@@lancewatanabe5825 Thank you, glad it helped! I think OEM is the way to go. I always think "do I want to do this job a 2nd time if it doesn't work right?"

@alexandrufedorovici5116 11 месяцев назад

what code does the part have? it just cracked on me … please

@StevesGarage 11 месяцев назад

06A121065AK - It's also listed in the description.

@grayfoxomega Год назад

What was the trick in getting the hard pipe to come out of the hole? Thing is stuck in there Edit: never mind I’m a dingus, pulled the wrong bolt out in the front. Came out easy once I got that bolt out

@StevesGarage Год назад

Sorry I didn't reply soon enough! There are a couple bolts around the pipe and it was hard to get a camera in there and actually show what's going on. I'm glad you figured it out though!

@Terminator_888 9 месяцев назад

Can I just seal it ? I don’t necessarily have to replace it…

@StevesGarage 9 месяцев назад

I'm not sure what you would seal it with. If the block side is leaking it's most likely the o-ring that's gone bad and you could replace just the o-ring. I replaced the whole pipe since mine was quite crusty and it would have to come out to swap the o-ring anyway.

@Terminator_888 9 месяцев назад

@@StevesGarage if just replacing the o-ring okay? The line looks really good no corrosion.

@StevesGarage 9 месяцев назад

@@Terminator_888 I would think replacing the o-ring would be fine if the pipe isn't corroded and the new o-ring can seal correctly.