Possible Blend Door electric issue

[semyaj]

Hello and good afternoon,

I have 01' Expedition XLT w/ 67000mi and for past week my climate control goes from hot to cold no matter what the temp dial is set on. While driving or parked if the temp dial is on cold it will blow really cold air and go to really hot air and any temparture between at random times. Anybody got any possible suggestion on what could cause this?

Thanks in advance,