I have a 99 Ford Explorer Limited and having problems with the A/C. It blows hot just fine, but when I turn it to cold, it still blows hot for about 5 min. and then it barely blows cold. I had the ac charged yesterday, so I know it's not that. It used to make a loud clicking/banging noise when I changed from one temp to another, but does not do that anymore, please help, I live in the desert and the heat is coming soon!