Volkswagen or any other vehicle shouldn't use any antifreeze. If any car is using antifreeze something is wrong.
Lack of antifreeze or wrong mix of antifreeze and water.
You spelled "beetle" wrong.
You can not. The two cars are completely different...the New Beetle has the engine at the wrong end. The New Beetle is bigger than the Old.
Your heater core has failed.
The headgasket has failed.
It will overheat and cause damage
Head gasket could be bad
If you use the Honda brand, you will not go wrong.
You probably used the wrong type of antifreeze. You should use the type for aluminum heads.