Silverado water leak!

Wehn i use the a/c in my 94 Blazer Silverado 4x4 and i stop the truck it have a leak of some kind of water. Is not a big amount of water but i think that it isnt normal or am i wrong?
Any help here? CLT.
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If its beneath your Blazer, it's the unit defrosting...if it's on your floor, a drain line is plugged.
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Thanks Advocate, for your answer!
CLT.
Advocate wrote:

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