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Old 01-14-2004, 11:40 PM   #1
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Default water "sloshing" in dash

For the past several months, I hear the sound of water "sloshing" around under the dash when turning, stopping, of accelerating my 2000 Bonneville. I suspect a clogged A/C drain, however is does appear to be draining. Ive tried to blow out the drain with compressed air, but no luck. Any similar conditions or thoughts on this?
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Old 01-17-2004, 02:58 PM   #2
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I have read over and over through the gm service site and could not find an answer for you. I suspect it may be an air lock but could find no reference to it.
Other than the sound is the hvac system working properly?
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Old 01-17-2004, 10:08 PM   #3
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i worked on a newer style caravan a few months ago. same problem. i thought the a/c drain was blocked too. it wasnt, here is what it was. under the cowl vents at the bottom of the windshield. there are drains so the water doesnt build up and flow into the heater box. after removing the cowl covers, there were a few leaves that had the drain blocked. when it would fill up, it drained it into the heater box, and not the side where the a/c drain is. i had to remove the blower fan, and use my vac pump and get all the water out of the heater box. and also remove the leaves that were blocking the drain.
had no problems since with it.
hope this helps you
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Old 01-21-2004, 11:51 PM   #4
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Thanks. The clogged cowl drain sounds feasible... I'll try to check it out this weekend. Not sure what will be accessible, and how difficult to get to the areas.
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Old 01-22-2004, 01:23 AM   #5
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Quote:
Originally Posted by eds2000bonn
Thanks. The clogged cowl drain sounds feasible... I'll try to check it out this weekend. Not sure what will be accessible, and how difficult to get to the areas.
Crawl under the car & look under the firewall on the passenger side for a rubber hose hanging down....that'* the drain tube!
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Old 01-22-2004, 04:30 AM   #6
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WHen your down there, take an old coat hanger and straighten it out and poke it clear. The drain tube I mean
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Old 01-22-2004, 07:14 AM   #7
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im wasnt talking about the drain for the a/c and the blower case.
i am talking about the drain area for the cowl. when water hits the windshield, it runs into the cowl area and has to go somewhere. there is usually a place for it to run off . if there are leaves and crap in that area, the water will run inside the car via the air inlet at the cowl, and go straight into the airbox for the heater and a/c. there is only one area of the blower case that drains at the drain tube, abd that is the evap. core area due to condesation when the a/c is on
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Old 01-22-2004, 11:40 PM   #8
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I follow you jeffrey10x2. Will try to figure out how to get to the heater box area. I had already cleared the a/c evaporator drain with no luck. FYI, the bonneville drain tube makes a 90 degree turn into the evap collection box... must use care using a hanger. I used a flexible tube and compressed air to blow it clear / check for obstructions.
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Old 05-08-2004, 08:55 AM   #9
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Default Found the problem for sloshing sound

I seem to have solved the slohing water sound problem... seems the coolant level was a bit low and there must have been some type of airlock in the heater core. I noticed heat was not putting out like it used to. Never had any kind of high temp, water level was just below the neck of the radiator cap. Added some additional coolant to the radiator and resevior and heat came back, sloshing sound went away.
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Old 05-08-2004, 01:28 PM   #10
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Default Re: Found the problem for sloshing sound

Quote:
Originally Posted by eds2000bonn
I seem to have solved the slohing water sound problem... seems the coolant level was a bit low and there must have been some type of airlock in the heater core. I noticed heat was not putting out like it used to. Never had any kind of high temp, water level was just below the neck of the radiator cap. Added some additional coolant to the radiator and resevior and heat came back, sloshing sound went away.
Good deal, Ed, but how do you account for the coolant loss? Do you have a vin K (L36)? If so, I would keep close watch on the coolant reservior for decreasing level, and have cooling system checked for leaks if neccessary.
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