i have a 2000 blazer 4.3L 4dr. the floor heater doesn't work, when i select floor it goes to just defrost, and when i select vent/floor, or defrost/floor, it just does the vent, or the defrost. any suggestions would be awesome i have no idea what is wrong and its 20 degrees out please please help.

 

your damper is broke.
search for a no floor heat would give you this.

https://blazerforum.com/forum/2nd-ge...or-heat-17808/

 

For me it was a motor.. hefty price if you're going to have a dealer do it though.