The bearings might be bad in the alternator.
That is not a question.
A clicking sound when you try to start the car is a dead battery. It may be that the alternator is not charging it properly.
horn not working on 2003 ford explorer sport trac, just a clicking sound
It CAN be CV joints, but it depends on the sound.
A loud clicking sound coming from the front of your car when you are driving straight would be the result of a bad CV joint. This is something that should be checked out right away.
The engine is clicking with all of the interior lights on? Dead battery... and for future reference... if there is no clicking= really dead battery and it might not recharge. In that case check the alternator, if the alternator is still good, just buy a new battery. If the battery continues to fail to recharge get a new alternator.
Solenoid or battery *Check the alternator as well. When my Camry did that, the battery and alternator both needed replacement. -andey78
Have the alternator checked.
Jump start car and ensure alternator and battery are good.
Gosh, do you have any idea where that sound comes from? Front or rear, under or over.... The more info you give equals a better answer....your question gets this answer. Since you had the time to post this you should have the time to correct the question and then expect a better answer.
Look at the half shaft.
Apparently it is the rear air "blender" ( whatever that is(?)) My 2003 Explorer was making the loud clicking sound from the rear driver side above the rear left wheel. I lived with it for a month before I just found the answer on the net. I turned off the rear fan control (from the front controls) and the clicking has stopped. I guess there is no more air from the rear now but the clicking has stopped- Car is long been paid off and I'm happy again.