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The fuse is in the engine compartment fuse box and is marked 'A/Con'. It looks like a Relay to me and as it doesn't have an amperage, my guess is that it is a relay. The different sites have slightly different variations, but the thing to check first is the relay. You mention 'heater coil', that is on the engine coolant circuit and only provides hot air. The AC compressor system has an 'evaporator' up in the dash and only supplies chilled air. I trust the AC job was done professionally with a Gas Recovery machine to create a moisture free vacuum before adding refrigerant gas. It can't be done at home. I wrote a Fixya Tip on it.
Please check the heater motor and also the thermostat. If those don't work, then this can also lead to your ac/heating system to malfunction as well.
Please use autozone to get a free diagnostic run on your car to get a list of errors. Then, they can tell you which errors are relevant to your ac/heating issue.
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