1992 s10 Blazer Vaccum leak

I have a vaccum leak at the control switch for A/C-Heater in the dash. is there any way to repair this without recplacing all the vaccum lines connected to the switch. The way it is now I can not use the A/c because it will not open the vent doors.

I believe you'll be pulling that control when you are going after your cluster for the lights replacement, killing two birds with one stone...fix it correctly then.

check all vacuum lines going to the vacuum ball in the engine compartment.

They are vacuum actuated.