The air conditioning compressor on the wife's 2009 Civic LX coupe is
engaging once in a while when no cooling mode or defrost mode is
selected. I first noticed this as what I thought was en engine
stumble at highway speeds during a 6 hour interstate drive we were
regularly making. After starting to pay better attention, I noticed
it was happening at irregular intervals all the time. Maybe 2-3 times
an hour that I could notice on highway drives. After a while, I
started to get the feeling it was the AC compressor.
Finally, while idling near a curb with an outside temperature of 3F, I
heard the famliiar click and condensor fan spinning up for about half
a second. All this has been taking place in the regular heater mode
with the floor vents selected.
Is there some function in the Civic that cycles the compressor once in
a while just to keep it lubed up or something? Or do I need to start
looking for wiring issues.