I know you have the Coleman A/C under the RV, so that must be where you're referring. When you say not hooked to power, I assume you mean 120 v AC. The converter/charger is usually located behind the 12 v fuse panel that controls the house appliances and lights.
I wonder what the setting is on your thermostat? Could it be trying to switch on air conditioning with no 120 v present? Make sure it's not set to Air Con. and see if the clicking stops.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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