It is not necessary to check the transmission fluid level.
A transmission fluid leak is the only reason for fluid loss. If a leak occurs, take your vehicle to a dealer/ retailer and have it repaired as soon as possible.
Change the fluid and filter at the intervals listed in the
Maintenance Schedule. See Scheduled Maintenance. Be sure to use the transmission
fluid
listed in Recommended Fluids and Lubricants.
Notice: Use of the incorrect automatic transmission fluid may damage the vehicle, and the damages may not be covered by the vehicle's warranty. Always use the automatic transmission fluid listed in Recommended Fluids and Lubricants.
Chevrolet Cobalt Owners Manual. Door Locks
To lock the driver door from outside the vehicle, turn the
key clockwise. Turn it counterclockwise to unlock.
The Remote Keyless Entry (RKE) transmitter can also
be used to lock or unlock the doors.
From the inside, use the manual lock knobs on each
door or use the power door locks.
Power Door ...