Here's why:
* Safety: Adding transmission fluid while the engine is running can be dangerous. The fluid is hot, and there is a risk of burns. Additionally, the transmission fluid can spray out, posing a fire hazard.
* Accuracy: It's difficult to accurately measure and add fluid to a hot transmission. The fluid expands when heated, and adding too much can cause damage.
* Mess: Transmission fluid can spill and create a mess when added to a running engine.
Here's what you should do instead:
1. Park the car on a level surface and engage the parking brake.
2. Allow the transmission to cool down completely. This will take about 30 minutes.
3. Locate the transmission dipstick. It is usually located near the transmission pan.
4. Remove the dipstick and wipe it clean with a clean cloth.
5. Reinsert the dipstick all the way and then remove it again. Check the fluid level on the dipstick.
6. Add transmission fluid to the transmission pan, using the dipstick as a guide. Add fluid slowly, checking the dipstick frequently.
7. Once the fluid level is at the correct level, replace the dipstick and tighten it securely.
Important Notes:
* Use the correct type of transmission fluid. Refer to your owner's manual or consult with a mechanic.
* If you are unsure about adding transmission fluid, consult with a mechanic.
