Why has my heater and my ac stop working in my mercury mountaineer 2005 v8?

What is your question?

Before my heater went out it was making a clicking sound in the dashboard. A local mechanic looked at my heater core and told me that the heater core was the problem. The heater core was so corroded, That it was causing a small leak on the passenger side front tire. I replaced my heater core still no heat. My ac went out right afterward it started making a loud clicking noise then smoking. Can this easily be fixed? Are these repairs going to be costly?

How long has your 2005 Mercury Mountaineer had this problem?

four months