Vag motor heaters

Hello good:
someone can help me about heater in a VW engine
I just need to know where they come because I am not able to find them

I do not know what type of engine you will refer, but if it is the engine with pump injectors (in any of its variants) they are inside the cylinder head itself, you will take to lift the balancing lid and "voila" there are, to the bark of the injectors, with a long 10 long carrier key you can get them well, the original mounted advice, (the bosch usually give problems)