1996 Chevrolet Astro Owner's Manual - Page 225

6. Put the heater duct over the engine cover studs. Push up on the duct gently until it snaps into place. 7. Reconnect the electrical connector for the cigarette lighter. 8. Grasp the bottom of the instrument panel extension and install the top into the groove first. Then,push the bottom of the extension intoplace. 9. Install the two nuts and two screws on the extension. Air Cleaner If you have the 4.3L engine (VIN Code W) with the rectangular air cleaner, you can change the air cleaner filterwithout removing the engine cover. Just lift the hood, unsnap both clips and remove the top. After changing the filter, snapboth clips to secure the air cleaner. Be sure air cleanerlid is correctly positioned to seal out dust and contaminants that are harmful to your engine. Make sure the fresh air hose is still attached after the filter is changed. Refer to the Maintenance Schedule to determine when to replacethe air filter. See "Scheduled Maintenance Services" in the Index. 6-17