Late last winter i noticed that only the driver side had heat. The air flow would switch from defrost-dash-floor with no issues but only the drivers side had heat in all settings. This is not my daily driver so i wasn't too concerned at the time, figured it was a blend door issue as I've read other post. Fast forward to several weeks ago i got in it and noticed that i had heat on both sides in all air flow settings, sweet it fixed itself. Nope, as i had heat, that is all i had. Not good with summer coming up lol. A few weeks late i got in and drove and everything worked as it is supposed to, A/C, heat both sides and in all air flow positions. Sweet, fixed itself again. Nope. Drove it last night and had no heat in any position, just A/C

Any ideas on where to start troubleshooting?