most likely an axle
If it speeds up as the car does, possibly correct. Might be a rock or nail in the tire also. If it does it sitting still, a spark plug wire may be off and arcing, a chunk of a fan belt may be hitting something, a bad fuel injector, any moving part on the motor may have something rubbing against it. Where the clicking is, when it does it, how loud it is, is it a click, a tap, tinny or hard? All help determine what it is. Some things you know just by hearing it.
If it is making a rapid clicking as compared to the slower intermittent clicking. One of your turn signal bulbs need to be replaced, normally it will only do this when the bulb is not working at all.
either your battiery is dead or your starter is going out, probably the battiery though
you figure it urself.
If it is a single click, the problem is either a loose battery cable or a faulty starter relay/solenoid. If the symptom is rapid clicking, the battery is probaly low.
If it is a rapid clicking, the battery has failed.
AnswerIf it's a rapid clicking sound that becomes more rapid when the fan is turned up high, you probably have a foreign object like a leaf stuck in the blower.It sounds like your Air door actuator or temperature actuator
A rapid fire mod is a mod that makes semi-automatic guns automatic
A rapid clicking turn signal usually means that a bulb has failed.
Rapid assessment occurs within the first few hours after an incident and is focused on lifesaving needs.
riffle
The rapid expansion of gasses.
A number of technological factors contribute to the rapid pace of change in businesses. Most notable are social media, fax, and internet services.