badmix
1/2 ton status
So, today was "drive the Blazer around" as I dont drive it often, try atleast once a week, sometimes longer.
Anyways, its nice out (finally cooling down), put the windows and go cruise to run errands, usually put on the VENT , just to get air circulating thru the vents and get the blower going, etc.
Well, put the vent on and only feel air at my feet,,hmmm, put the A/C on and nothing from the vents in the dash. Im like "great, now what".
So, get home, and really have no idea where to start, I know there are blend doors on the top of the "Box" under the dash, so i pull the glove box down and start poking with the vent door controls. I figured out the back one (closest to firewall) is strictly Hot / Cold and it works (but its mechanical straight from dash controls) but atleast the doors moved, etc.
Next was the blend door controls next to the hot/cold controls, well it looks like there is a rod that connects two doors and thats it , no exposed wires, etc. well in my wisdom and messing with a 30 year old truck, i broke one of the plastic retainers holding the rod to the arm to the blend door. Im like "oh well, deal with that later, lol"
So, I cycling thru the controls on the dash and manually moving these blend doors and sorta kinda understand what position does what, but they arent moving on their own. I also see vacuum lines running around back there and going to the kick panel, so I mess with that one and all the controls and NOTHING opened up that lil kick panel door, hmm, i get no change in vacuum sound or pressure when going thru controls, so I figure, probably vacuum issue. so I check behind the heater/ac controls best I can, and trace lines and then then I see ONE line going thru the firewall by the glove box.
so, I figure this is more than likely the source of the vacuum from engine to these controls, so pop the hood and trying to figure out where the lil line comes thru the firewall, it actually looked like it might be in the blower box or heater section but I found it a few inches away poking out of the firewall, i figure thats got to be it. I start to follow it and sure as sh!t, I see the line is broke in half against the firewall, just sitting here in 2 pieces.
I was like "Thanks gawd", this will be easy fix and it was, I had all the pieces I needed to fix this line and then tested the system and it all works as it should.
Took me about 2 hours total to figure this out and about 5 minutes actually fixing it. I had visions of me ripping the blend box out from under the dash or the controls being bad or who knows what. Im so glad it was a simple fix.
Once again, I couldnt imagine the ppl that dont work on stuff themselves what they wouldve done. This is why i like my truck, easy to work on. etc.
Anyways, thats my tale of the day.
Anyways, its nice out (finally cooling down), put the windows and go cruise to run errands, usually put on the VENT , just to get air circulating thru the vents and get the blower going, etc.
Well, put the vent on and only feel air at my feet,,hmmm, put the A/C on and nothing from the vents in the dash. Im like "great, now what".
So, get home, and really have no idea where to start, I know there are blend doors on the top of the "Box" under the dash, so i pull the glove box down and start poking with the vent door controls. I figured out the back one (closest to firewall) is strictly Hot / Cold and it works (but its mechanical straight from dash controls) but atleast the doors moved, etc.
Next was the blend door controls next to the hot/cold controls, well it looks like there is a rod that connects two doors and thats it , no exposed wires, etc. well in my wisdom and messing with a 30 year old truck, i broke one of the plastic retainers holding the rod to the arm to the blend door. Im like "oh well, deal with that later, lol"
So, I cycling thru the controls on the dash and manually moving these blend doors and sorta kinda understand what position does what, but they arent moving on their own. I also see vacuum lines running around back there and going to the kick panel, so I mess with that one and all the controls and NOTHING opened up that lil kick panel door, hmm, i get no change in vacuum sound or pressure when going thru controls, so I figure, probably vacuum issue. so I check behind the heater/ac controls best I can, and trace lines and then then I see ONE line going thru the firewall by the glove box.
so, I figure this is more than likely the source of the vacuum from engine to these controls, so pop the hood and trying to figure out where the lil line comes thru the firewall, it actually looked like it might be in the blower box or heater section but I found it a few inches away poking out of the firewall, i figure thats got to be it. I start to follow it and sure as sh!t, I see the line is broke in half against the firewall, just sitting here in 2 pieces.
I was like "Thanks gawd", this will be easy fix and it was, I had all the pieces I needed to fix this line and then tested the system and it all works as it should.
Took me about 2 hours total to figure this out and about 5 minutes actually fixing it. I had visions of me ripping the blend box out from under the dash or the controls being bad or who knows what. Im so glad it was a simple fix.
Once again, I couldnt imagine the ppl that dont work on stuff themselves what they wouldve done. This is why i like my truck, easy to work on. etc.
Anyways, thats my tale of the day.
I can't tell the number of times I've experience that same exact moment of frustration when something has stopped functioning as intended. Anyhow, I'm going through a similar air vent control issue myself. Keeping these old trucks on the road takes work (some more than others). 
