When I turn on the heater blower the engine starts making a loud droning noise

[EcoWandering]

Hey everyone,

I just got a 2020 Niro Hybrid 2 with 20K miles. When I turn on the heater blower, the engine starts making a loud droning noise after a few minutes.

Has anyone else had this issue?

 

[Casper4u]

@EcoWandering Hey, welcome! Just wondering, does this problem happen when the engine's stone cold, or does it still happen even after it's warmed up a bit? Also, what percentage is the battery at when you first start the car, and what's it at when the engine starts making that droning noise? Oh, and are you using recirculated air for the heater, or is it set to bring in fresh air?

 

[Jaghar]

That sounds like a potential issue with the HVAC system or a loose component. I’d recommend getting it checked out to avoid further damage.

 

[Halfton1877]

Could be something with the engine fan or a resonance issue. Might be worth popping the hood while it’s happening to see if anything’s visibly off.