Eratic heater 93 Taurus (Hot all the time) (cold all the time)

I have a 93 taurus the heater has hot air all the time even on max AC. A few weeks ago it was on full cool all the time. Is there a way to reset the computer? cntl,alt,del? on the car?
This also hapened about a year ago for a month and then started working again? any ideas?
Thanks
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Skip wrote:

probably the vacuum line attached to the heater (look under dash/heater box area for a loose or hanging vacuum line)....
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