1994 GMC Safari Owner's Manual - Page 238

If you have the 4.3L engine (VIN Code W) with the square air cleaner, you can change the air cleaner filter without removing the engine cover. Just lift the hood, unsnap bothclips and remove the top. After changing thefilter, snap both clips to secure the air cleaner. Be sure air cleaner lidis correctly positioned to seal outdust and contaminants thatare harmful to yourengine. Refer to the Maintenance Schedule determine when to replacethe air to filter. See "Scheduled MaintenanceServices" in the Index. I If the air cleaner isoff, a backfire can causea damaging engine NOTICE: fire. And, dirt can easily get into your engine, which will damage it. Always have the air cleaner in place when you're driving. Automatic Transmission Fluid When to Check and Change A good time to check your automatic transmission fluid level is when the engine oil is changed. Refer to the Maintenance Schedule to determine when to change yourfluid. See "Scheduled MaintenanceServices" in the Index. How to Check Because this operation canbe a little difficult, you may choose to have this done at a GM dealership Service Department. If you do it yourself, be sure to follow all theinstructions here, or you could get a false reading on the dipstick.