2006 Buick La Crosse Water sound behind dash

SRUBICAM

MEMBER
2006 BUICK LA CROSSE
6 CYL
FWD
AUTOMATIC
48,000 MILES

When I go uphill/downhill or turn a sharp corner, I can hear water sloshing around in the dash - I think in the region behind the radio/heater/ac controls. Buick had our local dealer install a restrictor to the heater core, but that did nothing to stop the sound. Others can hear this noise, so it is not just me. The dealer had replaced my radio earlier this year; the sound started after that, but I can't remember if it was immediately after.

The dealer's bodyshop also checked every possible entry point for water but said they could not find any place where water could have enter from the exterior of the car.

Help?

6 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

Hi
Has AC been in operation? Was evaporator drain tube checked for blockage? Water getting on carpet?
Let me know
Thanks for donate

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Wednesday, November 4th, 2009 AT 3:07 PM

SRUBICAM

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3 POSTS

The ac and heater both work fine. The dealer did check the evaporator drain and said it was fine, even though I told them that I was not seeing any water on the ground after using the ac like I did before. No, the carpet is not getting wet.

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Thursday, November 5th, 2009 AT 7:29 AM

DOCFIXIT

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If not seeing water under car when AC on then drain must be clogged. It is on pass side just above floor pan locate and clean with small wire.

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Thursday, November 5th, 2009 AT 2:26 PM

SRUBICAM

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3 POSTS

Sorry to take so long to get back to you - I had my brother try this over the weekend. The wire he used went in about 8 inches, but no water drained out. I can still hear it in the dash.

Is there a diagram available that he can look at to make sure he had the right place?

Thanks for all your efforts!

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Monday, November 16th, 2009 AT 9:23 AM

DOCFIXIT

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Take a look at this Reminder to Check HVAC Module Drain Tube Orientation During Pre-Delivery Inspection (PDI) TECHNICAL SERVICE BULLETIN Reference Number(s): 05-01-39-006, Date of Issue: November 03, 2005 Related Ref Number(s): 05-01-39-006 ARTICLE BEGINNING SERVICE INFORMATION This bulletin is a reminder to check the orientation of the Heating, Ventilation and Air Conditioning (HVAC) module drain tube when doing a Pre-Delivery Inspection (PDI) of a new vehicle. The drain tube should be pointed downward. Some vehicles have been found with the drain tube pointed in the upward direction, caused by the vehicle assembly process, which does not allow water to drain from the HVAC module. This condition will eventually lead to a water leak that drains onto the floor of the passenger compartment. Technicians should turn the drain tube so that it points downward, if necessary. Affected Model(s): 2005-2006 Buick Allure (Canada Only), LaCrosse