GM Service Manual Online
For 1990-2009 cars only

The filters are located in the heater and evaporator module in front of the evaporator core. The filters are accessed through a cover near the lower left front corner of the heater and evaporator module. These filters are designed to filter:

    • Fresh air entering the vehicle.
    • Recirculated air within the vehicle.

In addition to filtering dust particles out of the air, the filters are also designed to reduce unwanted odors that may enter into the vehicle.

The filter assembly consists of three separate interlocking elements. Each of these filters are identical in appearance and operation. These filters are removed and installed one at a time through the access door. The filters may be bent slightly which will allow for easier removal and installation.

Each filter element has a tab at the lower left corner to assist in the installation and removal process. The tab on the filter is channeled which helps to align the interlocking feature of the filters.

The filters have a 12 months or 20,000 km (15,000 miles) change interval. These filters may require frequent change intervals depending on driving conditions.