My A/C or heat always blows air through the bottom vent and front vents. A couple of months ago I only had head and a/c through the top and bottom vents but I switched a few vacuum hoses around and was able to get air blowing from the front vents but not the bottom vent is always blowing when heat or a/c/ is on. Im pretty sure its just a vacuum hose issue. I have a 96 blazer 4x4, my vacuum ball is attached to my hood. Can anybody here post detailed pictures of all the hoses that come off that vacuum ball and where they all go....mine are a mess and I cant seem to fix it



Also, if I have a vacuum leak in one of those lines would that throw an emissions code and cause my check engine light to come on? Just curious because ive had a emissions code saying its possible its the 02 sensor or the catalytic converter.

 

I messed around a bit with the vacuum lines and came to the conclusion that either I have air blow from the floor and front vents...or have air blow through the top and floor vents pending on how i switch around and hook up the vacuum lines. I think I tried every combination of switching vacuum lines but nothing got it to work completely. I will check again if I see any broken lines anywhere but if there are no broken lines then can I assume that it is an actuator that is broken? If so then which one?

Attached are pictures of how I have my vacuum lines set up...does anybody see any problems??

 

Scroll through here...this is my '96 Sonoma. I'm not aware of any codes that would come up because of leaky vacuum lines.