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Hello,I am a retired mechanical engineer with 56 years in this business. I will go in depth with you, and up to a 6 hour time limit.
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Rating does not affect your charges nor ability to refund if not satisfied. If you can agree to that, lets continue by all means.
click here please, you need the spray on foaming type coil cleaner at any hardware store that sells AC coil cleaning products
If the system still fails to cool properly, the gas may have leaked out again, you will need some AC stop leak chemicals put in and more refrigerant added.
Stay in touch as needed. When you have all that you need please select the 'finish and rate your expert' link near the top of your page to close the question, I will appreciate it.