Final answer:
To add transmission fluid to an automatic transmission, locate the transmission fluid dipstick, usually found in the engine compartment, check the level, and add the fluid carefully using a funnel into the dipstick tube.
Step-by-step explanation:
When you need to add transmission fluid to an automatic transmission, the process typically involves locating the transmission fluid dipstick. This dipstick is often found towards the back of the engine compartment, and it is usually marked with a specific color or label for easy identification.
With the car parked on a level surface and the engine running at idle (and after going through the gears to warm up the transmission), pull out the dipstick, wipe it clean, re-insert it fully, and then remove it again to check the fluid level. If the level is low, you will need to add fluid. The fluid should be added directly into the dipstick tube, which serves as the access point to the transmission. It is important to use a funnel to minimize the risk of spilling and to add the fluid slowly, checking the level frequently to avoid overfilling.