Depending on make and model sounds like a check valve clicking. It can sound like it is coming from that area. You say your unit is 16 years old. Honeywell did servey on unit 10 years and older and found out they loose 25% effeicency after 10 years. You may think about changing it out. With the new tax credits you can get a 16 seer unit for the price of a 13 seer. I went from a 10 to 15 seer and my power bill dropped 40%. Rus.
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