My 2013 heatpump, in ~40F weather, seems to turn on and off every 5-10 seconds. I can hear it click and watch the climate power gauge to verify that the pump goes off, and comes on at 250-350 watts, and then goes off, and on, continuously. Really noticeable when i am stopped without too much ambient noise and the radio is off.
i just drove my friends Leaf, which is also a 2013, and noticed his car does the same thing. Has anyone dug into why the heat pump is cycling so much? seems like a good way to wear out the relay, if not the pump itself.