2000 chevy blazer can not figure out where this line connects it connects to a "canister" by the fender

 

What line might that be? Information is key.

 

Do you have pictures of the line and the canister?

 

[IMG]file:///C:/DOCUME%7E1/Jessica/LOCALS%7E1/Temp/moz-screenshot.png[/IMG][IMG]file:///C:/DOCUME%7E1/Jessica/LOCALS%7E1/Temp/moz-screenshot-1.png[/IMG][IMG]file:///C:/DOCUME%7E1/Jessica/LOCALS%7E1/Temp/moz-screenshot-2.png[/IMG]
the picture says it appears to be canister

 

I believe those 3 hoses are Teed together on my Jimmy. I am not 100% positive about that though because it is not near me at the moment.

 

the hose that connects to the white piece in the picture it's connected but where does the other end connect

 

The one that goes into the firewall is probably for your HOT/COLD switch, thats vaccum operated, can you swith your hot to cold and back? You should hear a swooosh when you do that. Does the car run funny? Is there a hissing sound coming from it? Try plugging it with your finger if its hissing.

The one thats capped might be for a vaccun operated 4WD switch? Im not too sure, Im new to these blazers...

 

its a vacum resvoir. it holds vacuum under WOT conditions