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Old 09-26-2012, 09:31 PM   #1 (permalink)
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gurgling water sound from behind dash

hi guys,

weird noise coming from behind the dash sound near the driver's side. happens upon just starting up and taking off. sounds like water bubbles or water draining or something. been doing it for about3 years now since i purchased the 03 3800. no issues except for an occasional temperature gauge spike slightly above normal in hotter weather with traffic. figured it was air in the coolant line. tried bleeding the air out but still get the noise. whats the propper technique for bleeding air? i started the car and put the heat on high and opened the bleeder valve and let the car get hot and when mostly coolant was comming out i closed the bleeder.

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Old 09-27-2012, 03:44 AM   #2 (permalink)
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You are on the right path. It is low coolant. You are doing it correctly by opening the bleeder screws. Have you opened both?

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Old 09-27-2012, 05:37 AM   #3 (permalink)
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I hear this from time to time also. I'll check it out.

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Old 09-27-2012, 07:50 AM   #4 (permalink)
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3800 only has one bleeder screw, 3400 has two.

Just fill it and keep bleeding it, might take a while to get all the air out
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Old 09-27-2012, 08:23 AM   #5 (permalink)
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I haven't looked yet, any tips on where said bleeder screws are? I have the 3.4l

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Old 09-27-2012, 08:31 AM   #6 (permalink)
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On the 3400 there is one on the t-stat housing, and one on the water pump inlet pipe.

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Old 09-27-2012, 08:41 AM   #7 (permalink)
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Make sure your radiator cap is good also, otherwise there won't be enough pressure in the system (~15 PSI) to bleed out all of the air. You'll bleed til the cows come home and wonder why you can't get all the air out. I knew mine was bad when the upper hose kept collapsing like snakeskin after the engine cooled off.

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Old 09-27-2012, 02:25 PM   #8 (permalink)
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was pretty low on coolant. filled it at the radiator neck. cap looks good. believe its holding pressure. bled it again after i refilled. so far so good....

remember....

if it bleeds, we can kill it.

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Old 09-27-2012, 02:51 PM   #9 (permalink)
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When my water pump was leaking the only way I knew I was low or had an issue was the gurgling in my dash. I changed the pump and bled it a bit different than some with good results

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Old 03-04-2014, 11:12 PM   #10 (permalink)
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I have this sound.
It started approx. 2 months ago and it happens every time I start it up.
However, I haven't had ANY coolant leaks, temp spikes, or irregularities.


Is low coolant/air in line my issue as well?


TIA

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Old 03-04-2014, 11:23 PM   #11 (permalink)
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yes. more than likely.

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Old 03-10-2014, 01:35 PM   #12 (permalink)
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it came back. not sure why. annoying. but no ill effects.

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Old 03-10-2014, 03:25 PM   #13 (permalink)
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Small coolant leak.. Think about this.. The cooling system is supposed to be filled to capacity and pressurized therefore there should be no way water can flow back and forth behind the dash. That fact you can hear it flow means there isn't enough coolant to fill the hoses. Have the system pressure tested.

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Old 03-10-2014, 10:52 PM   #14 (permalink)
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I would check ur passenger side carpet guys. May have a leaking heater core.

Anywho If ur noise keeps coming back u either have a leak or u didn't get the system completely bled of air.

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Old 03-10-2014, 11:22 PM   #15 (permalink)
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g25 is on the money. You shouldn't hear splashing. Only time I did, the coolant was low or had air in the system after solving the low coolant issue.. Don't check the res to determine level. Check the rad.

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Water sound in dash? This thread Refback 09-26-2014 06:49 AM
gurgling water sound from behind dash - Chevy Impala Forums This thread Refback 09-26-2012 10:52 PM

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