EGR auxilary pump

landstuhltaylor · Apr 13, 2025

Recently I've picked up an insanely high-pitched whine from the engine bay when the heat is running in the cabin. The noise will cycle on and off directly if I turn the settings to get into cabin heat.

Oddly it does not sound like the cabin pump under the fender, and instead coming from the EGR auxiliary pump. Since this car is deleted (2011 TDI) can I just unplug this pump, or can I remove it from the circuit and replace it with a hose? Hardware delete of the cooler is on my to-do list but not something I have time for at the moment.

volkswagens-for-life · Apr 14, 2025

A high pitched whine.. or a high pitched screech? High pitched screech can very well be an EGR leak.

landstuhltaylor · Apr 14, 2025

It definitely sounds like an electric motor. Haven't had time to check it, but we did drive around a bit yesterday and confirmed that the problem doesn't appear at all as long as the HVAC doesn't dip into heating.

Might just do nothing with it until I get time to do the full cooler delete now that the weather is getting nicer. Just need to finish some other projects ahead of it.

volkswagens-for-life · Apr 14, 2025

I would bypass the cooler, for sure.. but not just cap it off

Lars_NM · Apr 15, 2025

Can't you just unplug the pump briefly wile driving and see if the noise disappears?

landstuhltaylor · Apr 15, 2025

Yeah that's my plan. I just don't drive it very often, but when I do it's usually a longer trip where I'm towing something. Will have to make time to check it before then.

SaVAGeSoot · Apr 15, 2025

Just about any "electrical" component can typically be output tested using VCDS....

landstuhltaylor · Jun 21, 2025

So...it's not the EGR at all. A simple stethoscope shows it's coming from the back of the engine bay.

EGR auxilary pump

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