climate control

Hey all! New to the Forum but have lurked on here for a while learning some things. My question is this: My AC Climate Controls on the dash have gone faulty somehow. I currently have the manual switch controls (Dorman 599-01) and I was wondering if I can plug and play upgrade to the digital...

The computerized climate control worked fine until suddenly it started cycling hot & cold & blowing high & low, no matter what the setting. There are even strange sounds of vents opening/closing when the system is off. The A/C appears OK, as the system is charged & the compressor engages when...

My 2003 Sierra has dual climate control it is now only blowing hot air no matter where the levers are set. Seems to go in and out. Is this the control unit or the heater core?