2005 chevy malibu when trying to start car smoke comes from coolant resivor wont start smells like exaust fumes. As the enine rotates smoke comes out same pattern as rotation of engine.No water mixed with oil.Radiator pressure test good no leak down.

SOURCE: my 1999 chevy malibu water pump leaks what should i do

replace the pump, it's a big job! watch out for plastic parts.

SOURCE: My 1999 Chevy Malibu is losing the coolant though the overflow hose by the resevior I've had my head gaskets replaced there is no overheating no water oil mix, but my radiator fans arent working I

Sounds like you need to disconnect the Radiators' electric fans and have them tested. You absolutely must have them working, or your car will overheat. Check to see if the Temperature guage is working.

You need to go to a good autoparts store and have them test the fans and charge and test your battery. You may need some sensors to activate the Radiator fans, but you could be running the battery down with shorted cooling fans.

There are also Relays which work with the Radiator fans. The overflow will stabilize once the water gets into where it belongs. Make sure your Thermostat is not clogged with the sealer.