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If you have no radiator cap that can be removed, you will probably have to do repeated cycles of engine temperature and just add coolant to the overflow until the engine stops draining it.
This isn't like a hydraulic (brake) system so the chance of leaving bubbles behind is far less.
With a radiator cap, it's pretty simple; run the engine until the coolant is visibly circulating and add coolant as the level drops.
Check the coldstart sensor,it might think that the engine is still cold and the fuel mixture vill then be wrong,you can also have leaking injectors and then it dripps diesel into the cylinders.
Your motor probably runs in "failsafe" mode (won't go past 3000rpm in highest gear), but in that case the ECU warning light should also come on (which might also be broken ofcourse).
Try releasing and reconnecting the battery (-connectors), which should "reset" any fault-codes in the ECU and see if the TDI power is back. Please note that the "cause" of the ECU faultcodes will probably put the motor back in "failsafe" mode within minutes ! But at least you've verified that your motor runs in "failsafe" mode due to serious faultcodes in the ECU.
You should have a dealer/expert read the ECU faultcodes using VAGCOM to determine the cause. A dealer will charge something like 50~60$ for it.
Since it's a 1.9TDI my best guess is that's it a broken N75 turbo-valve (common TDI issue, replacing the part yourself will cost less than $30 and 15 minutes). When the dealer suggests a complete replacement of the Turbo-unit (quite expensive), please have a TDI-expert do an 2nd opinion ...
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