Lots of messages in the archives, and Ken Wilfy has a good post.

The 'heat' wire can be slightly repositioned so the arc of the lever
pushes it more directly into the tube.  Also, flexing it halfway while
putting drops of liquid graphite at the opening will lube it up nicely.

Cheers, Tom Neal

> close the valve. Does your heat lever spring back a bit as you try to slide
> it all the way to the left? If so, this is your problem. Take some
> needle-nose pliers and force the metal rod into the black coax pipe so your
> valve shuts off. This is a temporary fix - I'm not looking forward to
> fixing mine - it looks like a bear. Basically it's just a bad engineering
> job waiting to break.

> >Hi-
> >I can't get the heater control completely shut
> >on my '86 GL any suggestions??