vent/defrost/heater????

[coolhandluke]

what controls where the air comes out, and where is this unit?

I took off the dash, and see the unit that moves when you slide the lever, and wires going off from it, but can't follow the wires to whatever they lead to. WHere is it?

Right now air comes out all 3 places equally regardless of where the lever is, what could cause this?

83 k5 originally diesel, now 350, 700-R4 12 bolt rear, 33x12.50 BFG Trails (yuck), desperately seeking a lift
sometimes nothing is a real cool hand

 

[MOABDADC22]

Those aren't wires, they are vaccum lines. Check to see that one of them is not kinked.

<a target="_blank" href=http://www.moabdadc22.alloffroad.com/>http://www.moabdadc22.alloffroad.com/</a>Real four wheelers don't need tools to remove body panels, paint, tail lights..etc.

 

[coolhandluke]

where do the vacuum lines lead to?

83 k5 originally diesel, now 350, 700-R4 12 bolt rear, 33x12.50 BFG Trails (yuck), desperately seeking a lift
sometimes nothing is a real cool hand

 

[1975k5]

the source is a vacuum canister on the firewall to the right of the heater box. It will look like a black ball that has been flattened(at least my 75 looks this way) and SHOULD have vacuum lines running to and from it. My 75 did not have a vacuum line running to it when I purchased the thing and it drove me crazy until I ran a source to it and it works like a champ.

Hope this helps

Tom

 

[prjt_blzr]

This is a common problem on GMs. Usually the culprit is the door that directs the airflow. There is a small plastic bracket that breaks and does not allow the door to open or close fully. This door is located just to the left of the glovebox behind the lower dash. If you remove the glove box, you will see a plastic duct that bolts to the heater box. Remove the two lower 5/16 screws and the upper screw to remove this. You will then see the door with a plastic bracket. If you run the truck and change the airflow from vent/defrost/heater you will see the bracket move. Make a new bracket out of sheet metal and you will be good to go.

 

[coolhandluke]

actually, my problem is that there is no vacuum canister at all!



83 k5 originally diesel, now 350, 700-R4 12 bolt rear, 33x12.50 BFG Trails (yuck), desperately seeking a lift
sometimes nothing is a real cool hand