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when driving during day time the front section is not cold enough but the backsection is working very good. theres no leak in the system . the was in the garage park for 3 years . when i bought it there was no refrigerant in the system it was emty no presure. i fill it up it start to work after a will it stop working good so i did vacuum the system add some refri oil and id start freezing again for one year . now is is not cold enough in the front during day time it blow a little bit of cold follow by almost nothing it keep doing this while driving . i want to know how many oz of refrigerant oil or compresser oil i have to put in the system and how many psi or oz of refrigerant i have to fill it with. or do i need to change something for better result. these vehicles has 2 systems one in the front and one in the back.