Engine radiator VALEO or OEM Volkswagen

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.

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.

Worked well on my Valeo radiator, let it soak 10 min and a lot of very brown water came out. No leaks, cools better.

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.

run a mk4 secondary rad.

my valeo radiator didn't come with anything.. im just hoping it doesn't leak from that zone.

I needed to replace the entire radiator in the GTI to get a check engine light to go away.

Be careful with the early MK8s. Mine is a 2022 and boy howdy she's got issues. Shift knob broke, steering wheel capacitor issues that disable travel assist repeatedly, backup camera failure and others say they have issues with the radiator failing to be fully seated on its clips and causing big problems.