Windows Fog Up

Some customers may comment about the windows fogging up on the inside of the vehicle. This condition may occur during high humidity conditions.

This condition may be caused by improper use of the HVAC system and/or excessive moisture captured in the front of the dash area due to the following:

Perform the procedure outlined in this bulletin to ensure none of the above causes are present and review the How to Keep the Windows from Fogging Up information in this bulletin with the customer.

To keep the window fog free, the climate control system knob should be positioned to Defrost/Heater mode (1) or Defrost mode (2). The Recirculate button should be left off (not depressed) so that the indicator light (3) in not On. Use of Recirculate in cold weather is not recommended and can result in window fogging. In cold or humid weather, outside air is the best for clearing the windows. To quickly clear the windows, put the fan control switch to high and push the "A/C" button (if equipped). For additional information regarding the HVAC operation, refer to "Climate Control System" in the index of the owners handbook.

Caution: Make sure the vehicle is properly supported and squarely positioned prior to lifting. To help avoid personal injury when a vehicle is on a hoist, provide additional support for the vehicle on the opposite end from which components are being removed. Ensure hoist does not contact fuel or brake lines.

1. Raise the vehicle on a hoist.
2. Check the HVAC module drain for blockage. If necessary, clear drain hole with a soft blunt tool such as a pencil eraser.
3. Lower the vehicle.



4. Inspect for gaps between the air inlet grill panel foam and base of windshield.

•	If gaps are present, remove cowl panel and install Kent Industries Adhesive Back Shim Stock (P/N 40115), or equivalent 8mm X 9.5mm (5/16 in. x 3/8 in.) foam. Refer to the appropriate model year service manual for removal and installation procedures.

-	On 1991-1999 vehicles, refer to Body Repair Service Manual.

-	On 2000-2001 vehicles, refer to S-Series Body/Electrical Volume I Service Manual.

•	If no gaps are present, continue to next step.




5. 1991-1996 SHOWN

Inspect both plenum drains for blockage. Clean with mild soap and water if necessary.




6. 1997-2001 SHOWN

Inspect both plenum drains for blockage. Clean with mild soap and water if necessary.




7. On 1997-2001 vehicles, remove both plenum drains. Use a stiff piece of wire and push wire through the drain slot to verify that the drain is clear.

•	If the drain slot is obstructed with debris such as leaves or dirt, moving wire back and forth in the drain slot should clear the obstruction. Continue to step 8 once the drain slot is determined to be clear of obstructions.

•	If the wire will not push through the drain slot, the blockage may be urethane sealer. Continue to next step to clear the obstruction.




8. Use a right angle pick or cotter key removal tool to scrape along inside edge of the plenum drains to remove any urethane sealant. Once urethane sealant is removed, re-check the drain slot with the wire to ensure the drain is open.



9. 2001 VEHICLES ONLY

Remove the air inlet screen on the right side of the vehicle.

10. Clean the surface with 100% isopropyl alcohol and allow to dry.
11. Replace the air inlet screen with P/N 21031308.

21031308 - AIR INLET SCREEN

To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System as follows: