Possibly because you still have an air pocket in the system because of not bleeding properly. Low coolant typically means just that. You need to bleed the air out completely before the light will go out. If the entire cooling system, not just the radiator is not full of fluid the light will continue to stay on.
Could also be the sensor on the radiator on the passenger side...
Fill the vehicle with coolant and leave the filler cap off. Start the vehicle and keep adding fluid as the coolant level drops. When the motor is warm enough for the thermostat to open up you will see the coolant level drop quickly. Put in more coolant until it is full then shut off the motor and put the filler cap back on.
ONLY GET VW COOLANT or be dumb and put cheap stuff in and pay for it later. NEVER put green coolant in. Will destroy all coolant parts. It will rot them. Happened to me. I had to replace it all. as with most cars you should almost always follow vehicle manufactures recommendations. I'm lucky, I have a 20 years plus VW dealer tech in the family and he warned me of this when I bought my 1998 2.0 GTI. The same is true when adding power steering fluid. In high school auto shop I was taught that regular ATF fluid was acceptable to use in place of power steering fluid. not the case any longer.
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