Ive own both Mk6 1.8T Jetta and now have a Mk5 2.5L Jetta and both have required new radiators at 150k miles. they have not been leaking coolant since.
I ordered the Nissen Radiator from Rock Auto for around $70 including shipping and ill go from there im planning on fixing it this weekend so ill keep updating
Awesome, I'm calling the dealer today to get a radiator, heater core and thermostat.
I had a similar issue with my Mk4 VR6 Golf, coolant level would drop a tiny bit over time with no obvious sign of leakage..turned out to be a very small leak at the bottom corner seam of the radiator.
Bought a nissens radiator and also an ebay fan shroud with dual 12 inch fans. The oem fan draws a lot of current snd it burned out the plug so I decided to change out. The shroud fits right over the core.
Replaced radiator. Flushed out nasty brown water from cooling lines, heater core and flushed with distilled water 3 times. Pulled vacuum on cooling System and Refilled with G13 premix.
EDIT: SOLVED - noticed no leakage around thermostat, coolant ball, all belts were dry, and upper radiator dry. In the end it was the radiator.
Best one to get is the Nissens 68001A. I just put one in my 2000 9-5. For some reason Rock Auto only lists it as fitting 2001 but it will fit a 1999-2001.
The radiator on my 2016 is leaking, although leak isn't really the right word. Maybe porous. The hole is so small, it takes months to show a change in the coolant reservoir. On some days, given proper conditions, a small wisp of steam is visible coming from the radiator area. I added a UV dye to the cooling system, and it is visible then.
After the copper OEM radiator broke I replaced it with a nissens aluminum radiator now the thermostat never hits operating temperature, I changed the thermostat to what the book wanted which was a 190 degree thermostat but even still the gauge doesn't go up all the way. I replaced one of the senors and the main coolant temperature sensor but still it doesn't go all the way up. On top of that it takes the gauge a good 3 minutes just to move slightly. Doesn't need to be fix probably but still annoys me
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