[Manitcor]

Subject: Carpet Wet On Passenger Side of Vehicle (Clean Evaporator Case Drain, If Plugged)


Models: 1999-2000 Buick Century, Regal
1999-2000 Chevrolet Monte Carlo
2000 Chevrolet Impala
1999-2000 Oldsmobile Intrigue
1999-2000 Pontiac Grand Prix


Condition:
Some customers may comment that the carpet on the front passenger side is wet.


Cause:
This may be caused by foreign material plugging the evaporator case drain.


Correction:
Inspect the evaporator case drain for plugging.


Raise the vehicle on a hoist.
Remove the rubber elbow from the evaporator case drain tube by pulling the elbow straight off.
Insert a 9 mm (11/32 in) drill bit, or any other similar-type instrument, into the evaporator case drain to clean out the material that is blocking the drain. (The distance to the other side of the evaporator case is 130 mm (5 in)).
Re-install the evaporator case drain rubber elbow. A small amount of silicone spray on the inside of the rubber tube will allow it to be slipped into place very easily. Be sure that the rubber elbow drain hole is open.
If the evaporator case drain was not plugged, a water leak test will need to be performed using normal water testing procedures.
If no external water leak was found and the vehicle returns for the same type concern, the evaporator case will have to be removed from the vehicle and the foreign material removed from the evaporator case.


Parts Information:
No parts are required to perform this procedure.
If the rubber elbow is missing from the vehicle, install a new elbow. The addition of this rubber elbow will result in road and wind noise reduction at highway speeds.


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.


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