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Sounds like a direct short It sounds like it could be a vacume leak at the switch or control panel that controls the vents. What happens if you rev the motor a little bit more than idle say 2000 rpm's and then put the AC on? Not sure but it sounds like a vacume leak at the control panel also I would listen for a hissing sound down by the control panel. The loss of vacume if it was big enough could do it and that would explain why it was blowing hot air if the control wasn't working properly.

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Q: Why would your Pontiac Transport turn off the second you turn on the AC and even before this was happening it was blowing hot air?
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