I am trying to figure out what exactly is wrong with my 2003 Ford Explorers heater.?

My heater on my Explorer is not coming on. When I attempt to set the gauge to heat I get a clicking noise. My Ac is working just fine, but now that the weather has dropped below 40 degrees Im dreading to take my truck to work. Could anyone help me out with what is the problem...really trying to avoid the $400 repair bill if I can do it myself. Thanks!!
 
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