Hello, I once thought I had a problem with this heater control valve. Took
it out to see. I could blow through it when closed, so I thought it was
bad. I was wrong. The replacement valve also allowed me to blow through it
when closed.I cant explain this, but I put the old one back in and just
adjusted the cable,and all was well.If it is leaking externally it may be a
bad valve. Like said above, adjusting the cable is a bear.I think this
adjustment is near the radio. The heater vent flaps are removable. Look
closely at them and you will see a little black plastic clip that can be
removed. The vent flaps then drop out. You can reapply a foam seal(bus
depot?) for good vent closing in winter and summer.Pray that you dont have
to remove the lower dash cover.I think that when it was designed, they
confused this with a security seal. You will most likely have to break it
to remove it.