On my 87 GL Wolfsburg Edition, previous owner bypassed the rear heater core
by disconnecting the two hoses and putting straight plastic connectors to
only the front heater core hoses. Now I want to restore it to original
condition by installing two T's. I see two hoses coming straight down from
the rear heater core. Which is which? Does it matter? My concern is I want
the rear heater core to be completely cold when I shut it off in the summer.
Thanks.

Jean-Woo Kim