The best way is to take out the two tees in your heater lines that go to
and from the rear heater and replace them with straight couplers.  3/4"
copper pipe will work, or 3/4" EMT if you prefer to keep copper out of
the system (if you're used old fashioned coolant!).  You will need to do
this from beneath the car, and if you pinch off the hoses you won't lose
enough coolant to bother with bleeding the system.

These will last longer than the plastic tees the factory put in.

Save all the bits just in case you ever sell it to some poor guy in a
cold climate!
--
Stuart MacMillan
Manager, Case Program
800-909-8244 ext. 8208
Fax: 206-269-6360

Getting your share of the Net yet?
http://cobaltgroup.com
http://UsedEquipNet.com