Sick03L

OK Ive searched so now Im asking.

I have two noises when I turn on my AC. One sounds like my dash cluster is eating gravel and the other is bubbling, liquid, gurgling, high pitch noise coming from the left side vent area. What is going on. The gravel sound is killing me.

Sick03L

OK so Ive bleed the living crap out the coolant system and still no change. It sounds like gravel every time I change the temperature a couple of degrees then goes away. Change temp and it sound like living creatures eating rocks in my dash. Please help.

entryspeed

iTrader: (3)

Dam man suckage again, the bubbling might be the freon passing through the orphis tube/valves. May be see if your freon is low. As far as the gravel sound who knows.

Sick03L

Yeah, Its sounds AC related like pressurized liquid but its clearly coming from behind the left side air vent. The rats eating gravel has me frustrated. Maybe a servo motor? Who knows but Im sure Ill get it figured out at some point.

entryspeed

iTrader: (3)

Yup and yes it definetly could be servo gears but that would only before a moment when switching settings. the servo should not be going for any length of time, unless its not moving at all and there is a sensor waiting to pick up its position. These cars are amazingly technical, maybe to much so. I still love it though gs400 is definetly in my top 5 of the 50 or so cars I've owned. When are we going to get together LOL. We need to admire are used time consuming beauties.

Sick03L

Would not mind a gtg sometime soon. We can sit and ***** about all the little issues that drives us nuts and then fix 1 of the 50 and then feel like we accomplished something.
Going to have the AC evac'd and charged today, figure it cant hurt right? But what confuses me is the gravel noise sounds like its coming from the steering / dash cluster area and even over to the center vent area. All the servos are right up under the glove box area and towards the center. It seems to do it when I change fan speed settings and change the temp. Sometimes it goes away quickly and sometimes it just lingers around.

lexusben

iTrader: (3)

I have a gurgling sound coming from dash area as well. When I start moving my car from a stop it gurgles for a second then stops. It seems to do this randomly. The sound actually went away for a while after I received a coolant pressure test, but now it is back. I have had my coolant changed since (when I got my 90k maintenance).

blueman26

i have the same problem with my 2004 430. it seems to make the gurgling sound when the engine is cold and idling and when for a second when i pull away from a stop light. fortunately i do not have the living-creatures-chewing-on-gravel sound which leads me to believe the gurgling and gravel sounds could be seperate issues. Anyway, it's very annoying and I'm about to give up hope on trying to figure it out on my own and just take it to the dealership Has anyone investigated this further? Is there a simple solution?

damiendaz

I had the same problem. It turned out to be on of the servo motors in the dash.

blueman26

By any chance do you remember what the price is to replace a servo motor? Thanks in advance, I really appreciate the info.

GS671

I hear the same thing when I start up the car and A/C. So I just turn up the stereo to drown the noise. I guess it might be that servo problem everyone talks about.