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Q: poor a/c performance , foggy windsheild w/defrost on on 1999 Dodge Durango

Even with heater/ac off,I'm getting a light mist from the vents(not defrost vents). A/C not cold att all. Is this the compressor ?
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I wonder if the heater core is leaking? Do you smell hot antifreeze or have you experienced coolant loss? To find out if the heater core behind the dash is leaking the cooling system will need to be pressurized with a pressure testing tool. A leaking heater core will cause the windscreen to fog up.
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