Mystery Vacuum line

[Jason Ramirez]

Help! I was putting new spark plug wires on and I must have popped this off and I cannot seem to locate where this goes. One end goes into the vacuum reservoir and the other line has this tee then check valve and then to the mainifold. Any ideas of what hooks into this? It’s make a sucking vacuum sound now.

1985 gmc k1500 305 1/2 ton caborsgee.

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[WFO]

It goes to the firewall, up by the air conditioner, to operate the heat/defrost door.

 

[Jason Ramirez]

It goes to the firewall, up by the air conditioner, to operate the heat/defrost door.

Thank you! I’ll look for thr connection to/through the firewall.

Cheers!