Auto transmissions operate on pump pressure. The pump turns when the engine is running. This is why it leaks only when running.
Vehicles with an automatic transmission may have lines that carry transmission fluid from the transmission to a separate tank on the bottom of the radiator.
Assuming you have a automatic transmission the dipstick should be located under the hood, behind the engine, on the passenger side.
Assuming you have an automatic transmission the dipstick is located under the hood on the passenger side in back of the engine, close to the firewall.
Listed under the hood on a placard and in the owner's manual.
maybe its automatic transmission fluid
Automatic transmission oil filters ware located inside the transmission, under the transmission oil pan. You have to remove the transmission oil pan to replace it and then you will need to refill it with new transmission fluid.
there is a drain plug just under the transmission (for automatic transmission) on the driver side
The automatic transmission was the 4L-60e for under 8500lbs GVWR and the 4l-80e for over 8500lbs. As for manual transmissions it would be the HM290 5spd for under 8500lbs GVWR and the NewProcess 4500 for over 8500lbs.
Non-functional Automatic Transmission
You will need to provide more information on the problem. Is it an automatic or a standard? If it's an automatic, is it a three speed or four speed overdrive, and what exactly are the symptoms? If it's a standard, in what gear and under what circumstances does the problem occur?
It's under the transmission fluid pan on the tranny.
There should be two dipsticks under the hood on a Malibu. One will be plainly marked "OIL" or "ENGINE OIL." The other one is your transmission fluid. This is assuming your Malibu has automatic transmission. If your Malibu has a manual transmission (stick shift), then there is no dipstick for transmission fluid -- manual trannies get lubrication from the engine oil.