To find out if yours has one and where it is located:
1. Check your owner's manual: This is the definitive source. It will tell you the transmission type (e.g., 4L60E, 700R4) and if it has a dipstick, and its location.
2. Look around the engine compartment: If there is a dipstick, it's usually located near the engine, often on the passenger side. Look for a long, thin dipstick with markings. However, don't rely solely on this visual check as many automatic transmissions don't have one.
3. Check near the transmission: If you can't find it in the engine bay, carefully look around the transmission itself. Some are located on the side of the transmission.
If you can't find a dipstick: Your 1998 Chevy Blazer likely has a sealed transmission that doesn't require dipstick checks. Transmission fluid level and condition are checked by a mechanic using specialized equipment. Attempting to check the fluid level without the proper tools can be difficult and could cause damage.