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845 Posts
Discussion Starter #1
Ok I know theirs a TSB for passenger cold feet, I tried searching here and couldnt find a thing.

Does anyone know the TSB for it, And the part number to fix it? I know it has to do with a gasket around the heater core or something like that?

On sunday my old man said it was like riding on a horse driven carriage.

TIA Bill

1,240 Posts
<H1>Passenger SIde of Vehicle Colder/Warmer Than Drivers SIde (Repair HVAC Case to Cowl Seal) #01-01-37-008 - (03/29/2001)</H1></TABLE>Passenger Side of Vehicle Colder/Warmer Than Driver's Side (Repair HVAC Case to Cowl Seal)

1999-2001 Chevrolet and GMC C/K Pickup (Silverado, Sierra) and Utility (Suburban, Tahoe, Yukon, Yukon XL) Models

2002 Cadillac Escalade<A name=ss1-791061><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=791061&psdid=210&evc=sm#ss1-791061" target="_blank">

Some customers may comment that the passenger side of the vehicle may be:

  1. <LI =1>Colder than the driver's side when the heat mode is on.
    <LI =1>Warmer than the driver's side when the air conditioning (A/C) mode is on.
    <LI =1>There may be dampness on the vehicle dash assembly when the A/C mode is on. </LI>
<A name=ss2-791061><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=791061&psdid=210&evc=sm#ss2-791061" target="_blank">

Condition may be due to poor sealing of the HVAC air inlet case to the front of dash or the recirculation mode door actuator may not hold the recirculation door closed while driving.<A name=ss3-791061><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=791061&psdid=210&evc=sm#ss3-791061" target="_blank">

Replace the recirculation door actuator (if necessary) and repair the HVAC case to cowl seal using the following procedures:

  1. <LI =1>Place the A/C control in the manual heat mode.
    <LI =1>Remove the fixed mast radio antenna.
    <LI =1>Open the hood and install fender covers.
    <LI =1>Remove both wiper arm assemblies using the following procedure:

    1. <LI =A>Disconnect the washer solvent hose from the air inlet grille panel nozzle.
      <LI =A>Remove the cover from the wiper arm retainer. Remove the retainer.


      Use a battery terminal puller in order to remove the wiper arm.

      <LI =A>Rock the wiper arm back and forth in order to loosen the arm from the drive shaft. Remove the wiper arm. </LI>
    <LI =1>Lower the hood.
    <LI =1>Remove the air inlet grille panel using the following procedure:

    1. <LI =A>On each end of the air inlet grille panel is a rubber flap for the hood hinge cutout. Lift this flap and remove the air inlet grille panel attaching screw.
      <LI =A>Remove the air inlet grille panel center top push pin.
      <LI =A>Remove the clips that position the forward edge of the grille panel to the top of the cowl.
      <LI =A>Disconnect the windshield washer supply hose from the bottom of the grille panel.
      <LI =A>Remove the air inlet grille panel by sliding the panel rearward up the windshield and out. </LI>
    <LI =1>Just to the left of the right hood hinge, on the horizontal surface of the cowl, locate a cover that is sealed in place. The cover has TRW stamped into it.
    <LI =1>With a sharp knife, cut out the panel following the panel impression in the sealer tape.
    <LI =1>Place a lifting device between the cover and the dash. Lift the cover enough to allow another tool to depress and release the front retaining tabs by pushing rearward on them. Remove the cover.
    <LI =1>Look through the opening where you just removed the cover. You will see what looks like a piece of foam about 76 x 127 mm (3 x 5 in). This is the A/C recirculation door that is within the HVAC module.
    <LI =1>Reach into the opening and carefully pull on the air inlet recirculation door. If the recirculation door moves with very little effort, replace the air inlet (recirculation) door actuator (Manual systems only). For systems with the Automatic Temperature control, initialize the system using published Service procedures.
    <LI =1>Between the top of the HVAC air inlet module (appears as a 6 mm (1/4 inch) black strip) and the cowl sheet metal is a foam seal. This foam seal may be improperly positioned or damaged in some way (insufficient crush/sealing). This may allow outside

845 Posts
Discussion Starter #3
Thank You very much...Looks like kinda of PITA for something like this, but will get her done.

Thanks again

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