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I have a 1999 Explorer with a 4.0 engine and when it gets cold it has trouble starting. It will click for a while and then start, but when it is warm I have no problem starting it. Any help would be appreciated.
The clicking that you are referring to, is that a rapid series of clicks from the starter relay or solenoid? That sounds indicative of a weak battery or a poor/loose connection to one of the battery cables.
Since the battery is pretty new, start by making sure the battery cable connections are clean and tight. But, I wouldn't rule out the battery just because it's pretty new. If you have a multimeter it should be pretty easy to test.