[mjtr21]

okay my mother stopped at mechanic after work and he had to put 1 whole gallon of coolant in. so now i know theres a leak somewhere. i looked near thermostat area and it looks "wet" so i'm assuming that when he replaced the thermostat it wasnt tight enough or gasket is not sealing. i also felt upper rad. hose and it was pretty warm. any ideas on places to look for leaks. engine is 3.4 liter and it has about 124000 miles on it. thanks.