Heater problem.

[97gmc]

I have a 97 k 1500 and I have awesome heat coming out of my vents. But out of defrost it's like warm at best. Wondering if I got a bad actuator somewhere or what? 

 

Another thing is air always blows out of vents. No matter if it's just on defrost only or floor only. When I put on vent it only blows out of vents

Thanks in advance

[Logan Lanfear]

Probably the actuator under the dash that changes where the air flows out of.  I've never had to replace one but it sounds like something could be wrong with that.