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That an electrical short. The fan relay or the fan switch sounds like the troublemaker. when the ignition is off, the fan shut down.The relay is an "on & off" switch for the fan.If the relay is "sticking" in the on position, the fan will continue to run until the battery dies. Same scenario if your Polo is equipped w/ a fan switch. If the switch is stuck on, the fan runs. There's the short. get someone u trust to ck that out. Good Luck, happens all the time.
had replaced: both cooling fans, fan control module, coolant temp
sensor, fan switch, 4 terminal connectors. No trouble codes reported in
VW electronic diagnostic test. 2 different VW dealers and and my
mechanic threw in the towel. Any suggestions greatly appreciated."
This is a common problem with the VW..and no one has an answer WHY. (including VW mechanics)
The fuel pump has 2 sources of power, when you crank the engine power to the pump is supplied through the cranking circuit of the ignition switch, after it starts the power comes from the run circuit, you most likely have an issue with the ignition switch.