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I have a 2003 Envoy. Frost is blowing from air condition vent and I'm just wondering why. It just started doing this. Also, when I start up the vehicle, it makes a clicking sound. I don't know where the sound is coming from even when I raise the hood. Please help. Trying to avoid spending lots of money if I can do something myself.
 
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Your A/C is freezing up. This can be a symptom of being low on freon. You will need to take it to a technician who can put the guages on it to check this out.

If the freon level is OK, it could be an expansion valve or thermostatic control. In any event, you will need a technician to diagnose the problem.
 
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