ws27
Well-Known Member
Has anyone ever adjusted the linkage on a heater box for a 66-67 b-body? I've been working on a 67 Belvedere for a while, I upgraded all the underhood parts, rebuilt the vacuum switch, and now it won't switch to heat until you go to defrost. All the vacuum lines are correct and I used the vacuum schematic to confirm that vacuum is applied to the correct actuators in each mode.
I think the damper for the heater mode is not adjusted correctly. The manual is horrible for this adjustment procedure. It literally says apply vacuum to two actuators, then apply pressure (who knows where) to the linkage until A,B,C (not sure exactly which levers are A,B,C) then tighten adjustment screw (again not sure which screw)!
I'm hoping someone may have been through this nightmare before, if not once I figure it out I'll post it here.
There are three shafts connected to dampers with two actuators. So in essence, there are three functions being controlled by two actuators and some complicated linkage!
here's a pic of a guinea pig box I have laying around to experiment on:
I think the damper for the heater mode is not adjusted correctly. The manual is horrible for this adjustment procedure. It literally says apply vacuum to two actuators, then apply pressure (who knows where) to the linkage until A,B,C (not sure exactly which levers are A,B,C) then tighten adjustment screw (again not sure which screw)!
I'm hoping someone may have been through this nightmare before, if not once I figure it out I'll post it here.
There are three shafts connected to dampers with two actuators. So in essence, there are three functions being controlled by two actuators and some complicated linkage!
here's a pic of a guinea pig box I have laying around to experiment on: