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· Premium Member
2003 Sonoma SLS ext. cab 4.3L / 4x4
2,699 Posts
I can't really help positively ID the hose function - are there nearby hoses that aren't connected? Windshield squirter nozzles? One thing for sure, the vacuum hoses below thew wire harness are in need of replacement.

· Registered
03 GMC Sonoma SLS & 04 Chevrolet Blazer Ls
1,293 Posts
I have a 04 2dr Blazer mine don't have that hose. Let's start what is it hooked up to? we see where it ends. That might help figure out what it went to. Your other vacuum line in the picture is in desperate need a replacement looks like it's getting ready to disintegrate.

· Been there Done it
16,858 Posts
If you have the 4 button AutoTrac 4wd switch that would go to the front axle vacuum switch on the firewall. The Tee should be connected into the rotten hose.
This is how your vacuum lines should look and the 2nd pic is of the front axle engagement switch on the firewall.
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