I have a 2003 2.5TDI T4 I recently had a completely flat battery and had to take the battery off to charge it, when I reconnected it there was a whirring noise coming from what sounds like a fan. Has anyone any idea what this could be and what it does? It's obviously that whirring continuously that flattened my battery. Thanks
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Could be the auxillary water pump, electrics will do strange things when battery voltage low. Or is it with engine running. Have often noticed when i have jump started a vehicle with flat battery while the alternator is working like hell to charge battery the alternator will sound noisey then quieten down as the battery charge builds up. Oh hello and welcome.
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Heater fan is off, I'd thought of that I think it is the auxiliary water pump, it's running with the engine not running and the ignition off. I've had to disconnect the battery to stop it going flat again, as soon as I connect it again the pump starts up with ignition off. A garage has unplugged it now so I can use the van, but what does it do and what turns this on and off? Thanks for any advice.
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It pumps coolant around the engine at certain temps, on our corrado it runs for ages after a run. Not the end of the world if left unplugged but as red says think the sensor is in the coolant flange. Loads on fleabay you may even find a deal with flange and the sensors as a job lot. We did with the stat housing on the VR6.
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Originally posted by Wendy View PostHeater fan is off, I'd thought of that I think it is the auxiliary water pump, it's running with the engine not running and the ignition off. I've had to disconnect the battery to stop it going flat again, as soon as I connect it again the pump starts up with ignition off. A garage has unplugged it now so I can use the van, but what does it do and what turns this on and off? Thanks for any advice.
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Originally posted by S49 View PostIt pumps coolant around the engine at certain temps, on our corrado it runs for ages after a run. Not the end of the world if left unplugged but as red says think the sensor is in the coolant flange. Loads on fleabay you may even find a deal with flange and the sensors as a job lot. We did with the stat housing on the VR6.
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