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Tabe said
>I didn't want to remove the tees under the van so I got some partially threaded bolts of the right diameter from the hardware store, chopped off the threaded part, gave them a quick coat of paint, and plugged the two feed lines under the seat with them.   >Makes reinstalling the heater core (if you want it!) much faster than removing the tees.

I did the same, but used stainless bolts.  More money, less time (no painting). Now that I replaced the heater hoses, I removed the T's and the rear heater lines.  Van off the salt roads in the winter, love the extra storage space and with the new front heater core, I don't even need the front fan wokring����