Info about PTC (high-voltage heater)
In vehicles with a high-voltage system, the high-voltage heater (PTC) is used as a supplementary heater.
It’s mounted from factory mainly in TDI Polos, because cars with a diesel engine are heating up more slowly, so their heater has an supplementary heater AKA auxiliary air heater (PTC) . PTC takes more electricity, so it requires a good battery and an alternator with a larger capacity than the standard one (pay attention to this if you intend to retrofit it in a gasoline engine).
heat exchanger-3- → the same in all models:6R0819031 (6R0 819 031)
or6C0819031 (6C0 819 031)
heater element for electr. auxiliary air heater (PTC) -2-6R0963235 (6R0 963 235)
air distribution housing -1-6Q0819875E (6Q0 819 875 E)
To install PTC in heater without this from factory, you need to replace your air distribution housing to 6Q0819875C or 6Q0819875E:
PTC photos:
PTC retrofit – ELSA diagrams
PTC in CGGB engine
Diagram 1
Low heat output relay, High heat output relay, Engine control unit
Diagram 2
Fuse 1, Fuse 2, Fuse 3, Auxiliary air heater element
PTC in CFWA engine
Diagram 1
Auxiliary heating heater element contact switch, Automatic glow period control unit, Engine control unit, Glow plug 1, Glow plug 2, Glow plug 3
Diagram 2
Low heat output relay, High heat output relay, Engine control unit
Diagram 3
Fuse 1, Fuse 2, Fuse 3, Auxiliary air heater element
