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2004 impala: water leak..side under..the front end is facing up hill

Customer Question
2004 impala, has water leak...
2004 impala, has water leak on pass. side under the dash. will FILL the floor board during a rain storm but only if the front end is facing up hill. looks like the heater core area?
Submitted: 9 years ago.Category: Chevy
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Answered in 13 minutes by:
6/9/2008
Chevy Mechanic: goodwrench9124, ASE Certified Technician replied 9 years ago
goodwrench9124
goodwrench9124, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3,432
Experience: Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
Verified

Hello and welcome to JA!!!! the first thing to check, there is a weatherstrip just under the cowl area. right where the right wiper arm sets. this weatherstrip is supposed to sit on the bottom of the glass. but they will fall off and cause water to run in the a/c box, and then in the vehicle. here is a picture. the arrow in the picture shows the weatherstrip seal

Object Number:(NNN) NNN-NNNN Size: SH

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Customer reply replied 9 years ago
Reply to goodwrench9124's Post: yes ive checked this weatherstrip before, its on good and still leaks?
Chevy Mechanic: goodwrench9124, ASE Certified Technician replied 9 years ago

ok, there is a waterdeflector that gm makes, that will deflect the water away from the cowl area. this part was orginally made for monte carlos and grand prix's. but wil work on impala's. i have used this deflector before and normally takes care of the leak. it is easy to install and is cheap to buy.

 

Object Number:(NNN) NNN-NNNN Size: SH

 

  • Discard the rubber water deflector.
    Object Number:(NNN) NNN-NNNN Size: SH

  • Install the new designed plenum water deflector.

    Install the air inlet grille panel.

    Install the push pins.

    Install the washer hose.

    Install the hood seal.

    Close the hood.

    Return the windshield wipers to the park position.

    15212454

    Deflector-Plenum Water

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    Customer reply replied 9 years ago
    Reply to goodwrench9124's Post: just checked with the gm dealer and that is not a good part number.
    Chevy Mechanic: goodwrench9124, ASE Certified Technician replied 9 years ago

    should be, maybe a part number change.

    #03-08-57-006B: Water Leak on Front Passenger Floor (Install Water Deflector) - (Feb 25, 2005)

    Subject:Water Leak On Front Passenger Floor (Install Water Deflector)

    Parts Information

    Part Number

    Description

    15212454

    Deflector-Plenum Water

    Parts are expected to be available from GMSPO on 3/2/05.

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    Customer reply replied 9 years ago
    still no part # XXXXX?
    Chevy Mechanic: goodwrench9124, ASE Certified Technician replied 9 years ago
    ok, i will run the part number today at the shop, i will let you know if there is a new part number. i will get back with you tonight!!
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    Chevy Mechanic: goodwrench9124, ASE Certified Technician replied 9 years ago
    ok, the part number change to 15794785
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    goodwrench9124
    goodwrench9124
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    Category: Chevy
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