Gurgling or boiling sound under dash?

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Gurgling or boiling sound under dash? - 1/10/2007 11:55:01 PM    48fan   Posts: 56 Joined: 12/29/2006 Status: offline I recently made a 2000+ mile trip in my Silverado and at the end of the trip I noticed that upon acceleration from a stop their is a 'gurgling' sound or the sound boiling water makes coming from the passenger side under the dash.  The sound disappears when I reach cruzing speed.  Anyone had this happen or any suggestions of what this could be? Obviously its coolant making the noise, but could there be a problem in the heater core?  One person I talk to said it could be the temp valve is stuck and there is an air gap and the sound is the coolant rushing through the valve to fill the gap.  Does this sound right?  If so what’s the fix? Thanks in advance, Mike Post #: 1

RE: Gurgling or boiling sound under dash? - 1/11/2007 5:47:39 PM    golfer   Posts: 610 Joined: 10/8/2006 Status: offline Did you have any work done to the cooling system ? Sounds like air trapped in the system. (in reply to 48fan) Post #: 2

RE: Gurgling or boiling sound under dash? - 1/12/2007 5:20:53 AM    kcb37   Posts: 504 Joined: 7/3/2006 Status: offline Even if the valve was stuck you shouldn't have any air in the heater core, but that is what it sounds like to me.  Or it may just be the water pump speeding up and pushing the coolant thru.  You may want to look at it a little more closely to make sure it dosen't have a small crack.  That could pull air into the system. (in reply to golfer) Post #: 3

RE: Gurgling or boiling sound under dash? - 9/12/2007 11:17:22 AM    dsullins85   Posts: 1 Joined: 9/12/2007 Status: offline I have just recently started having the same problem in my 2001 s10 manual 4.3 blazer. I also noticed that my oil pressure was rising pretty as the gurgling sound occurred. I dont really have any experience fixing automobiles so any help would be nice. Where should I check to see if there is a crack. Have you been able to fix this problem? (in reply to kcb37) Post #: 4

RE: Gurgling or boiling sound under dash? - 9/25/2007 7:32:03 PM    knuts   Posts: 10 Joined: 9/25/2007 Status: offline Is your low coolant light on?  Mine started doing the same exact thing (02 2500HD) and it drove me nuts.  I took it in and they replaced the low coolant sensor (and the bottle) and changed the coolant. They said "it" was leaking and shorted out the sensor. Maybe allowing air to get in there I guess. But no more problems now.  Should've just bought the bottle and done it myself but they were replacing a loose catalytic converter (warranty!) at the same time. Good luck. (in reply to dsullins85) Post #: 5

RE: Gurgling or boiling sound under dash? - 9/26/2007 8:32:28 AM    golfer   Posts: 610 Joined: 10/8/2006 Status: offline quote: ORIGINAL: dsullins85 I also noticed that my oil pressure was rising pretty as the gurgling sound occurred. Oil pressure ???  or Temperature ??? (in reply to dsullins85) Post #: 6

RE: Gurgling or boiling sound under dash? - 11/12/2007 6:47:17 PM    dusmith1981   Posts: 1 Joined: 11/12/2007 Status: offline I drive a 2001Silverado and just started hearing this noise as well. Did you ever find out what the problem was? (in reply to 48fan) Post #: 7

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