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With the Blazer running with Air on, raise the hood and feel the Accumalator (large tank on passenger side of engine with AC hose going into it and it is connected to your firewall) to see if it is cool or cold. If it is hot, it seems your system is either out of freon or your A/C compressor is gone.
If it is cold, then inside under the dash your heater/AC box has a door that is open either because the vacuum motor that moves it is bad or the door is stuck. You will have to get a manual on how to get to it and repair it.
The way it works is: When you have AC on and turn your temp knob on the dash, the vacuum motor opens a door to allow some air from your heater core to move across your AC evaporator to warm up the cold air. The more you turn the knob, the wider the door opens allowing more air to move from your heater core to your AC side of that box. The heater is always working, just the door opens to varying degrees for more or less heat. Normally with the knob set for all blue or cold, the door is completely shut and you get only cold air out the vents.
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∙ 13y ago
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