My A/C blows really cold but sometimes after 10-15 minutes in will start blowing regular air, if I turn it off for a while it will blow cold again. My Heater does not work also maybe this has something to do with this? I heard there is a computer behind the glove box that might be bad, does anyone know what my problem is (besides having a Lemon)

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97 F-150 4x4 3'lift 35's exaust, bumpers, intake