The gas filter should be changed at 30,000 miles, the AC pulls about 5-10 horsepower from the engine when on, you will feel this, the Kia has a small engine, if you are talking about a more serious drag then you may have the system overcharged or the compressor is starting to fail.
Fuel filters should always be changed when you due an oil change. bad fuel filters is the number one reason of fuel pump failuresand bad engine performance. the reason for loss of horsepower with the a/c on is because your engine has to work harder and it uses more fuel. this should only be a slight loss. if it's a dramatic loss then it's a different problem. in order for me to help you more can you be more specific in detail.
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The gas filter should be changed at 30,000 miles, the AC pulls about 5-10 horsepower from the engine when on, you will feel this, the Kia has a small engine, if you are talking about a more serious drag then you may have the system overcharged or the compressor is starting to fail.
Fuel filters should always be changed when you due an oil change. bad fuel filters is the number one reason of fuel pump failuresand bad engine performance. the reason for loss of horsepower with the a/c on is because your engine has to work harder and it uses more fuel. this should only be a slight loss. if it's a dramatic loss then it's a different problem. in order for me to help you more can you be more specific in detail.