Hvac problem no heat.... Help Please

[darkriderzx10]

I own an 98 c5 with 70,000. this summer i had to replace my digtal climate control because I could see the tempture display. So i went out and purchased a new one. AC worked good all summer. Now that it is winter and i want to run the heat i get heat out of the passenger side but on the drivers side i get cold air. I changed the digital reading to 90 degrees and i dont get anything but cold air what could this problem be.ad;help;help;help:confused

 

[Hib Halverson]

If you're going to DIY this problem, you need the Factory Service Manual and it's HVAC troubleshooting and service data.

That's the place to start.