Where are the bleeder valves for coolant system located on engine of a 1999 Chevy Malibu?

There isn't a single, universally located "bleeder valve" in the traditional sense on a 1999 Chevy Malibu's cooling system like you might find on some older vehicles. Instead, air is typically purged from the system through a process of filling the radiator and then running the engine, allowing the coolant to circulate and push out air pockets.

The location of any *potential* air pockets that might require special attention varies. You might find:

* Radiator Cap: While not technically a bleeder valve, opening the radiator cap *slowly* after the engine has been running and cooled down slightly can help release some trapped air. Always be extremely cautious when opening a hot radiator cap to prevent serious burns.

* Thermostat Housing: Some air might become trapped around the thermostat. This is usually released during normal operation.

* High Points in Hoses: Air might collect at the high points of the hoses. Gently squeezing these hoses while the engine is running (carefully and with the engine properly cooled down before working with it) may help dislodge air bubbles.

In short: For a 1999 Chevy Malibu, focusing on properly filling the radiator and allowing the system to run and burp itself is the usual method. There's no dedicated bleeder valve you need to find and manipulate. If you're still having trouble with air pockets after properly filling and running the engine, consulting a repair manual specific to your vehicle's engine (e.g., a 3.1L, 3.4L, or 3.8L V6) is recommended. This manual will give you diagrams and specific procedures.