No leg heat on passenger side

[ItsMrBill]

During a return back from northern New Hampshire last night (outside temps 19 degrees), my wife complainded that cool air was blowing on her feet instead of warm air. I mentioned to her that the there was plenty of warm air coming from the foot wells of the drivers side of the truck as I was not having any problems.

Well after 30 minutes of this, I pulled over to see what her problem was and sure enough the passenger side floor heater was blowing cold air. After cycling the air direction controls as well as the recirulation, cold air continues to be the norm for the passenger side.

Has anyone run into this problem or have any ideas what I should look for before I take passenger side foot heating system apart?

[mdrag]

ItsMrBill,

There was a service bulletin for the 2001 trucks to address this complaint. I'll see if I can locate the TSB number - I think I have it in my files somewhere.

I'm moving this topic to the 2500HD/3500 HD Trucks & Drivetrain forum.

mdrag

[dave p]

you had better get used to it or trade trucks. i have had mine to 7 dealers and it still blows cold air on the passengers right foot. my 98 chevrolet 2500 had the best heater, but my 2001 is worthless. also the air conditioner is not as good. its a another gm screw up and there is no fix for it. if you find one please let me know as i have gave up trying to get it fixed. dave p :confused: :confused: :confused:

[gardnerteam]

I had the same problem on my 2002. Took it to dealer, who advised there was a service bulletin. Fixed it in one try and it has worked fine ever since. All of my previous 6.5 bodies had the same problem and they never could solve it, but on the 2002 it was solved with the first try.

[mdrag]

ItsMrBill,

I found the TSB:

PASSENGER SIDE OF VEHICLE COLDER/WARMER THAN DRIVER'S SIDE (REPAIR HVAC CASE TO COWL SEAL) #01-01-37-008

1999-2001 CHEVROLET AND GMC C/K PICKUP (SILVERADO, SIERRA) AND UTILITY (SUBURBAN, TAHOE, YUKON, YUKON XL) MODELS

2002 CADILLAC ESCALADE

CAUSE
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.

CORRECTION
REPLACE THE RECIRCULATION DOOR ACTUATOR (IF NECESSARY) AND REPAIR THE HVAC CASE TO COWL SEAL USING THE FOLLOWING PROCEDURE.....

This is taken from an old copy I printed out in 11/2001, so there may be an updated TSB to address MY 2002 trucks. Good luck.

[ItsMrBill]

Thanks guys, I will contact my dealer and have them fix it. After researching this problem, does this require removing the dash? If it does what is the screw up percentage that I maybe worse off than I am right now?

[dave p]

i would like to know what issue of tech link the article appeared in? so i can show it to my dealer.
thank you for your help. dave p :cool:

[Kennedy]

Mine does that too, but I don't think that it is heater output related. I think it is radiant cold from the fresh air side of the recirc door. I plan to insulate up there and see what affect it has.

[gardnerteam]

Dealer did remove my dash on my repair. There was also a new or additional part he had to get prior to doing it. It has been 8 months and I do not remember any of the other particulars, except it took care of the problem.

[mdrag]

dave p

I got the TSB off a website that used to post them until it shut down suddenly one day...sorry I don't have any more info to give you.

mdrag

[ItsMrBill]

Here is the procedure as I found it on the Web.


Passenger Side of Vehicle Colder/Warmer Than Drivers Side (Repair HVAC Case to Cowl Seal) #01-01-37-008
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

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

Colder than the driver's side when the heat mode is on.
Warmer than the driver's side when the air conditioning (A/C) mode is on.
There may be dampness on the vehicle dash assembly when the A/C mode is on.
Cause
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.

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

Place the A/C control in the manual heat mode.
Remove the fixed mast radio antenna.
Open the hood and install fender covers.
Remove both wiper arm assemblies using the following procedure:
Disconnect the washer solvent hose from the air inlet grille panel nozzle.
Remove the cover from the wiper arm retainer. Remove the retainer.

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


Rock the wiper arm back and forth in order to loosen the arm from the drive shaft. Remove the wiper arm.
Lower the hood.
Remove the air inlet grille panel using the following procedure:
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.
Remove the air inlet grille panel center top push pin.
Remove the clips that position the forward edge of the grille panel to the top of the cowl.
Disconnect the windshield washer supply hose from the bottom of the grille panel.
Remove the air inlet grille panel by sliding the panel rearward up the windshield and out.
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.
With a sharp knife, cut out the panel following the panel impression in the sealer tape.
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.
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.
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.
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 ambient air to enter the passenger compartment incorrectly (under driving conditions). This can be corrected using the following procedure:

Important
It is imperative that a good seal be achieved over the entire surface areas (no voids or skips), especially around the rear and sides of the HVAC case to cowl areas.


Seal the area between the cowl and HVAC case with RTV Silicone Rubber Sealant, P/N 12345739 (in Canada, use P/N 10953541).
Using your finger, from the engine side of the cowl, ensure that the foam is stuck nicely to the HVAC module and does not have any distortions.
From the engine side of the cowl, working through the opening in the horizontal surface of the cowl, place a shop cloth into the opening and cover the blower fan. This keeps silicone from dripping onto the motor and causing an imbalance condition.
From the engine side of the cowl, working through the opening in the horizontal surface of the cowl, apply the RTV silicone to bridge the gap and cover the foam between the cowl sheet metal and the HVAC module case. Inspect your work with a light and a mirror. Ensure that no gaps or skips are present in the RTV seal.
Inspect your work for potential drips, runs, etc. If no problem is seen, remove the shop cloth covering the blower motor.
Apply a 3 mm (1/8 in) bead of weatherstrip adhesive, P/N 12345097 (in Canada, use P/N 10953479) around the opening in the horizontal surface of the cowl, where the cover fits into the cowl.
Place the cover on the workbench, top on the surface, and apply a 3 mm (1/8 in) bead of weatherstrip adhesive on the edge of the cover.
Place the cover into the cowl opening and snap into place.
Apply another bead of weatherstrip adhesive around the joint between the cover and the top of the cowl. Smooth this bead into a smooth surface with a finger or tool of some kind.
Place the leaf screen to the cowl. Attach the washer supply hose to the bottom of the air inlet grille panel. Do not place the fasteners in at this time.
Install the radio fixed mast antenna. Tighten 1/4 turn after contact is made with the base.
Lower but do not close the hood.
Center the opening in the air inlet grille panel around the antenna mast and then install the air inlet grille panel retaining screws. Tighten
Tighten the screws to 2 N