Chris,
It seems to me that joining the two hoses would create a circuit whereby hot
coolant could circulate back to the engine without ever passing thru the
radiator.

A catastrophic blowout like that happenned to me and it was the plastic
bleeder valve on the rear heater. The local VW shop (it was still in
warrantee) replaced it with  what looks like a brass pressure relief valve.
Wash off the core really good before you re-connect it or it will STANK..

Best o luck
John Meeks
Top of Lower Michigan
'91 MultiVan

> -----Original Message-----
> So is it better to join the two hoses or cap them? Also should I just
> try and measure the concentration and add water/coolant as neeed or
> flush all over again?  Thanks again for all the help.
>
> chris  almida
>