Strange Thunk

[llll1l1ll]

Hi y'all,

So I've noticed that there's a slight, rhythmic thunk/thump that I can feel through the steering wheel. It happens when the car is at idle and only when the HVAC is on. It does it with both the a/c engaged and disengaged. I popped the hood and you can feel the thunk in the fender, too. It's veerrrry slight and happens every 2-3 seconds. Super strange.

Anybody else have this?
Pete

[PirateZHP]

Hi y'all,

So I've noticed that there's a slight, rhythmic thunk/thump that I can feel through the steering wheel. It happens when the car is at idle and only when the HVAC is on. It does it with both the a/c engaged and disengaged. I popped the hood and you can feel the thunk in the fender, too. It's veerrrry slight and happens every 2-3 seconds. Super strange.

Anybody else have this?
Pete

I have this as well. It's a very very slight "thunk". It seems like there is something dripping, but my car is dry. I'm in for answers as well...

Sorry that I'm no help.

[llll1l1ll]

Hahaha I'm just glad someone else knows what I'm talking about.

Earlier today it was audible. More of a tap then a thunk. It is not relative to engine speed. Really the weirdest thing. Engine bay was dry! Carpets are dry!

[llll1l1ll]

I did some Googling. Turns out it could be the heater control valve: http://forum.e46fanatics.com/showthread.php?t=615757

[PirateZHP]

Ahh... hmm... Well, I am soon to refresh my cooling system, so we'll see about this as well.