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 and Housing Re...  

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