Under the van are the 2 long heater hoses running right next to the 2
long main coolant pipes.
Figure out which of the 2 hoses warms up first.
Cut it in a accessible spot and add a valve with the lever facing where
you can best reach it.
An autoparts store should carry heater valves with the right hose diameter.
Dennis says 5/8" and I think some later vans may be 3/4".
This is the inside hose diameter.

Clamp the hose pinched shut on either side of where you are going to cut
it to reduce coolant loss.
Or work quickly and expect coolant dripping down your arm.

Mark

On 6/30/2023 2:52 PM, Steve Williams (Contractor) wrote:
> Hi,
>
>
> I have a fairly severe case of my front heater valve leaking hot water
> by and constantly heating my wife and I up... at 30C it's kind of
> sub-optional!�  lol.
>
> I want to do a "quick fix" and put a ball valve in the�  heater hose.
> I've heard you can do that behind the glove box.
>
> What is the internal diameter of the heater hose?
>
> What kind of valve would I need?�  Something that would take hose clamps.
>  � I live in a small town and the local hardware store didn't have
> anything suitable.�  Either solder on (copper plumbing) or PEX crimp on.
>
> Any pointers are appreciated.
>
> Thanks,
> Steve Williams