Mine was clicking when warming up, loud like a 220 relay.
The top electro-vacuum valve to def. was bad, I don't think that little valve could make that much noise, I also tightened the connection for the alarm under the rt. floor and now I have no loud click but if the radio is off and I listen for it I can hear the climate control click as it cycles, but not very loud. It should do nothing until warm enough to blow heat.