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What causes my 1999 expedition air conditioning to blows warm air?

Anonymous

∙ 17y ago

Updated: 8/16/2019

If the heat is on that would explain it.

But if you are running the air conditioning, the compressor is on and fully charged with r134 it is probably the air mix door inside the heater stuck in heat mode.

Wiki User

∙ 17y ago

What else can I help you with?

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