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generally when it blows cold at first then gets hot, it is because there is air and moisture in the system, which vercomes the dessicant inside the system. What happens is that as the thermodynamic cycle of moving heat goes on, water in the system will freeze at the expansion valve (the coldest point in the system), until so much ice is in that spot that no refrigerant can flow, so no heat can be moved. If you put a proper et of AC gauges on it, the low pressure side would show zero or a negative pressure, while the high side would be >150... Usually low should be between 25 and 45, but because the system is frozen up, nothing moves, so the compressor is acting more or less as a vacuum pump... Have a professional evacuate the system, replace the receiver/dryer, add a bit of oil and then charge the system to spec. Then youll have air. I bet it was improperly charged in the past... causing this issue... Good luck! JMH

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Q: Dodge Dakota air conditioning blows cold air then humid warm air?
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