When it stops working do you mean that it quits cooling or the a/c compressor goes bad ????
If it quits cooling and the a/c compressor is good then you either have a leak in the system or the system has a restriction.
If the a/c compressor is bad then you have a lot of trash in the system from the first one that was replaced..............
You will need to replace this filter every 4 months.
If you shut it off properally then every 6 months to 8 months.
Every 2 months
Every month is a working month for most jobs. Teachers may work anywhere from 8 to 10 months depending on the school and level.
every 6 months
Every six months
Yes, it is recommended that you do so every 3-4 months
Every 30k or 24 months.
It is suggested that the filter be replaced every 8-12 months
Your car's owner's manual will specify how often you should replace the coolant. In general, every 24,000 to 36,000 miles is about right, or about every 24 to 26 months.
Basically it lasts for 300 filterings but you should replace them every 2 months
Replace Heater Core