my AC doesn;'t work i though its just need to recharge. so i bought the kit from Walmart that come in 3 bottles and the gauge. turn out that i already have refrigerant. i know my car take R12 - but the kit i have is R134a.so i convert to R134a. so what do i do now? could it be the pump? ac fan? bell? or should i get the old shit out then pump in R134a. if so how do i get it out ? use a pump? where they sell the vacumpump.