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Old 12-20-2020, 11:36 AM   #2
Scooby Newbie
Member#: 483823
Join Date: Mar 2018
Location: Stone Ridge, NY 12484

Originally Posted by joea99 View Post
This morning, coldest day of the year, so far, started up and was presented with a "flapping" or "motor boat" sound. Or "stick in the bicycle spokes" sound.

06, manual trans, auto HVAC system.

It is not engine speed or fan speed related and is quite loud. Seems to be coming from center console area if I stick my head in the passenger wheel well. From the engine compartment, it comes through the firewall bulkhead from that same area.

What could it be? Told him to drive it as it does not seem to be a problem right now.
I can add this noise is present with the key in "run" position and engine not running, but not in the "accessory" position.

The noise is "faster" once the engine is running (higher voltage) but does not vary noticeably with engine speed. The fan speed and vent controls all seem to work properly and do not change the frequency of the "beats".

I can feel thumps "in time" with the noise when touching the blower motor assembly behind the glove box area.

Clearly it is something "electrical" but no clue.
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