1999 Oldsmobile Alero Severe windshield fogging in wet weat

JCMOHR

MEMBER
1999 OLDSMOBILE ALERO

Interior problem
1999 Oldsmobile Alero 4 cyl Front Wheel Drive Automatic 120K miles

Looking for help to repair a SEVERE fogging problem with my fiancee's car. Never seen anything like this. When it's raining, the air vent at the base of the windshield blows tons of moisture; not just fog. Water just runs down the glass. Cooler weather naturally makes the condition worse. There is no heater core leak, no antifreeze odor. Car was purchased used before I met her. Very dangerous to drive. Anti fog chemical helpful, but not sufficient.

1 Reply

IMPALASS

MECHANIC
3,112 POSTS

Hello -

I have attached a TSB on a similar problem with these vehicles. You must have a leak that is allowing the water to enter the AC Vent system.

Review this TSB and look in the same area. . .. . .. . .. . .

Hope you had a great Christmas!

Air Inlet - Heater Blower Inoperative/Interior Floor Wet
Notes

File In Section: 08 Body and Accessories

Bulletin No.: 01-08-57-003

Date: September, 2001

TECHNICAL

Subject:
Heater Blower Inoperative or Water on Passenger Floor
(Install Sealing Strip)

Models:
1999-2001 Oldsmobile Alero
1999-2001 Pontiac Grand Am

Condition

Some customers may comment that water drips on the front passenger floor or that the heater blower is inoperative in cold weather.

Cause

This condition may be caused by water entering the fresh air inlet to the HVAC case due to poor sealing of the air inlet screen to the fresh air inlet opening.

Correction

1. Open the hood and remove the windshield wiper arms.

2. Remove the air inlet screen panel and replace the foam seal. Refer to illustration above.

3. Inspect the cowl drain holes located at each end of the cowl. They should be open and free of debris.

4. Reinstall the air inlet screen.

5. Make sure the lip on the lower windshield lace sits on top of the air inlet screen panel when installing the air inlet screen.

6. Reinstall the windshield wiper arms.