The older, cheaper model tanks can be disabled through the generous application of molotovs.
For one, Molotov Cocktails could be used by being thrown into open hatches. If properly thrown, it could land inside the tank, with deadly consequences. In the past, the crew would usually burn to death, but with modern day extinguishing systems like Halon tanks this may not happen.
However, electronics can still be damaged or destroyed, and overall the tank will most likely be rendered inoperable. In WWII, if thrown at the engine bay (back) of the tank, it will knock out the engine resulting in a M-Kill, or mobility kill. However, the tank could be mostly operable (turret can be traversed with a hand-crank, gun can also fire).
The older, cheaper model tanks can be disabled through the generous application of molotovs.