97 Camry A/C problem

The A/C of my 97 Camry can not make cool air. The light on the A/C button is on and when the switch turn to out air flow-in I can feel very weak cool air but in the inner circulation, the air is always warm.
Is there a leak in the A/C system? If I want to use a recharge kit, will it be O.K.?
By the way, can anyone tell me where is the low pressure hose in front trunk? (I found a hose with a L marked on the top just behind the engine)
Thank you.