Vacuum Acuators

[sansonekm]

99 sierra 2500 but it's one of the crossovers so I basically have a late 98 c/k model. I need to know where the vacuum actuators are so I can see which ones aren't working cause my heat is only going through the main vents and not changing to feet or defrost.

[2COR517]

Pretty sure all your heater controls are electric. My 97 is slow going to defrost sometimes.

[sansonekm]

let me try to rephrase what I'm trying to do. I know it's all electrical it's just that I need to know if power is getting to the doors or if the doors that change the vents need to be replaced. I know there's one underneath the driver side of the dash but that just changes the air to the side vents on the dash. I need the one that changes the air to the defrost vents.

[Mike G]

I believe you are referring to the "blend door actuator". These are a common problem, but I cannot tell you where to find it. From what I have heard, it's not a pleasant experience to work with.

 

Welcome aboard!

--Mike

[sansonekm]

Blend door actuators does sound more correct. I know they're not easy to get to, but then again I don't feel like spending the money for my mechanic to get to them and fix a problem that I could do.

[2COR517]

Haynes or Chiltons are very good for stuff like this. Lots of good reading too!