Best AC Repair and Maintenance Tips   
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My AC has been running smoothly for about 9 years now. Here is what I do:

I run my AC regularly, even in the winter, at least 15 minutes a week

I clean my air filter as often as I can

I keep my car dry and avoid excess moisture (and as clean as possible)

Yearly checkups, inconvenient but, in my opinion very worth it, as they have saved me money in the long run.
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1.Run the air conditioner once a week for about 10 minutes.

2.Run defrost mode for about 5 to 10 minutes. 

3.Use your air conditioner in winter. In addition to cooling your vehicle, one of the air conditioner’s primary functions is to remove humidity from the cabin. It works especially well when you need to remove fog from the windshield to improve visibility.

4.Re-charge your air conditioning system.

5.Get a full air conditioning service.
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Change/ Clean the dirty filter:

Your car’s ac comes equipped with a cabin filter which clears out the dirt before the air enters into the cabin. The cabin filter gets clogged with dust and dirt particles. Clogged AC filter badly affects performance and cooling. This is the most simple thing that you can do yourself to maintain your car’s AC. Just take the filter out and clean it regularly. If the filter is too clogged, you can go for a replacement.

Use your car’s AC every day:

Make sure you make your car’s AC work for about 10-15 minutes every week even if it’s not in use. The vents and other vents will remain to function well if this practice is followed. This way you will keep your car’s AC young for long!

Check the refrigerant level:

Make this a part of your car’s scheduled service. You should always ask your mechanic to check the refrigerant level in your car’s AC. This will give you an idea about how much refrigerant is still there and when you will be needing a refill. Running your car’s AC on low refrigerant levels also hinders the performance and the cooling. To obtain the most cooling from your car’s AC, ensure that the refrigerant is always at the correct level.

Get your car’s AC serviced regularly:

Just like you get your car’s engine serviced, the AC also needs to be serviced at regular intervals. The best time to get your car’s AC serviced is at the end of winters. This is because when the season is changing, you can avail the best prices and discounts. If the summers arrive the demands go really high and you will have to wait for long while you get your AC serviced and will also end up paying high.
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Maintain my car AC by doing these steps:

* checking the high pressure and low pressure sides pressure 

*Measuring the vent air temperature 

*cleaning of the condenser and the evaporator.

* Cleaning /replacing of the car AC filter.
by 1 3 9
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Following are the things which I personally follow to keep my A/C running smoothly :-

  1. Make sure the air filter is cleaned timely and replaced when required. 
  2. Keep the front radiator grill clean. 
  3. Turn on the fan first for few minutes with windows rolled down, than switch on the A/C so that hot air gets pumped out.
  4. 2 to 3 minutes before you reach your destination, turn off your A/c (not the fan) so that the refrigerants get enough time to get out of the cooling coil and into the compressor back.
  5. Use your a/c in winters at least once in a week for 10 minutes.
  6. Make sure you get your a/c serviced according to the manufacturers recommendation. 
  7. Use the re-circulating air mode. 
  8. Park your vehicle away from direct sunlight if possible.
  9. Lastly, the life of the a/c depends on the manufacturer as well. Japanese car a/c are the best and needs least maintenance.(Personal experience)   
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Make sure your car compressor is in good shape. Regularly check your coolant, and use the right one suitable for your type of car. Make sure your car does not over heat because it can affect the air conditioning system. Frequently clean the system of dust. 
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