just like adjusting a bicyle brake cable ..
adjustment is by movement of the outer cable housing , in this case at
the upper end where the levers are.

it is VERY common for the temperature lever cable to be 'sprung' ...
due to a dumb and cheap design.

when you increase temperature you are pulling the inner cable out of the
outer housing, opening the heater valve.
when you are reducing the temp, you are pushing the cable back into the
housing.
The geometry of the design is a bit dumb ...no, it's very dumb and cheap.

there is about 1 1/4 inches of unsupported inner cable when temp is on
full hot ..
no one ever, ever lubes this cable of course..
so one day ..rather than slide back into the cable housing ...it just
kinks in a arc.

from then on you can't  get full heater valve control, you can have
plenty of 'on' but you'll never get full off.

this inspection, lubrication and adjustment needs to be done to every
watercooled vanagon there is, if it hasn't been done 1 to 5 times already.

lol..
If it moves, lube it.
If it's stationary, protect if from corrosion.
Often both.

VROOOM ~ !~
Scott

On 05/10/2016 01:30 PM, David Beierl wrote:
> At 03:04 PM 5/10/2016, David Bjorkman wrote:
>> Hi All;
>> How does one adjust the cables to the 4 lever ventilation
>> system?  I'm getting some blow by when the levers are in the off
>> position.  I am aware of the problem with degrading seals, but was
>> wondering it there was a way to pull the doors shut a little tighter.
>
> Move the cable sheath where it attaches at one end or the
> other.  Held on with spring clips at the box end, clamping plates
> with screws at the controls end.
>
> Yrs,
> d
>
>
>> Dave B.
>