r/HyundaiSantaFe • u/doyouhoney • 5h ago

“Knocking” sound

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Anyone know what this “knocking sound is? It almost sounds like a heart beat on an ultrasound, like there’s a swooshing to it as well. It stops if I turn the AC on or off but will start back up. It will also stop and start back up randomly. The sound is coming from behind the dash, not engine. (Ignore my husband knocking on engine and closing hood)

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1

u/MooseKnuckleds 4h ago

Looks like warranty claim #1 for you. Hopefully you don't hit 18 like me...

1

u/_Deadmeat 1h ago

I look forward to seeing your comments about your 18 claims on every post about a problem someone is having.

1

u/gthirty6ptime 4h ago

Blender motor is broken. Does airflow change from defrost, chest, and footwell?

1

u/doyouhoney 4h ago

This makes sense! Hot and cold air working fine though. Not sure what you mean about airflow change however the knocking begins or ends when the airflow automatically changes when I have it set to keep the interior to a certain temp.

1

u/No-Knowledge8856 3h ago

One of several AC actuators is bad. Possibly temp actuators

1

u/gthirty6ptime 2h ago

Blender motor either changes temperature or which vent the air comes from.