Transmission Fluid Leak?
Scotty my dad's 2005 Dodge Grand Caravan may be leaking fluid, he looked at the transmission Fluid Dip Stick and it said cold so he added half a bottle of fluid and drove it for 10 minutes checked the fluid level again and it said it was lower on fluid, then it said full on cold but didn't rise when engine got hot, the transmission is also slipping, my dad doesn't want a mechanic to sell him a part he doesn't need, do you know what the problem is?
The transmission fluid must be going someplace: can you lift the vehicle and see where it is leaking?
Also you should only check the fluid level with the car warm, running and on a flat surface. If your checking it cold one time, then warm, once running, once not running the levels are going to change.