Hi, my fren's car a/c blowing hot air recently, put in new gas but only lasted a day, diagnose by a/c expert .....cooling coil leaking. The coil was finally replaced(new) and a/c is blowing cool again... at a cost of $2600! this is d 2nd coil change in 2 years, previous one is also new & oem.Just for discussion, has anyone use cheaper china make coil? how long does it last? or is there any reasonable price longer lasting coil in the market? check online and found plenty very much cheaper coil!