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Mixing different coolant, red vs green can deteriorate seals for coolant. Leak could be because of this or just loose clamp on hose. Should completely drain system including engine block, flush, and refill with oem or equivelant.
would you believe that on all vw cars there is no drain tap for the coolant system.you have to unclip/takeoff the bottom hose on the radiator........then to flush it you connect a hose to the highest heater hose.......
So far since VW started using phosphate free coolant (pink or red), I haven't seen the need to flush it. This depends whether it was mixed with tap water or other coolant. Anyway, there is a drain valve at the bottom left side of the radiator along the lower hose. Just turn it lefty lucy. Just make sure it isn't hot and pressurized or it will scald you, so open the reservoir cap first before you attempt on opening the valve.
NOTE: Make sure you use only VW G12 coolant and if you need to mix water, the best is filtered drinking water (reverse osmosis), not bottled but something like Brita.
The radiator drain is going to be on the driver's side along the bottom of the radiator. Best is to remove the lower radiator hose to drain the coolant. Common for the plastic drain plug to break when trying to remove causing you more work and to go out and locate a replacement drain plug. That's why 99% of garages will drain the coolant from the lower radiator hose.
Thank you for using Fixya and good luck
There is a drain plug on the radiator on the divers side, inside at the bottom. Note: most of the time when the plug is removed the O-ring get's damaged and needs to be replaced since it sticks to the radiator. Most of the time it's quicker and easier to disconnect the lower radiator hose on the passenger side and let it drain there. Most of the newer radiator don't even have a drain plug and if you want a drain plug,you'll have to drill a hole where the drain plug should be and place one there. The drain plug is around $4.99 at most Auto Parts store. Good luck and hope this helps.
You have a leak in the radiator and it's not holding coolant. The coolant is evaporating through this leak and is causing the car to overheat. It doesn't matter how much you fill the radiator it will not hold any coolant/water until the radiator is repaired. Good Luck!!!
It's either a bad hose or a bad radiator. You'll just have to isolate exactly where the coolant is coming from to be sure. In any case, it needs to be fixed ASAP if it's as bad as you indicate or you will permanently damage the engine.