rear heater core hose blew...HELP

How do I get to the rear heater core hoses?

It has 2 tanks does anybody know how much they hold, before I end up spending a sh!t ton on gas.

I just bought an E350 super club wagon with a rebuilt 351W.

On my 97 the main heater hoses branched off the mains near the rear driver's side of the engine. The then ran under the body on the driver's side to the rear core. Mine was a conversion, so your may be slightly different, bit they are not hard to find under there. I would imagine that if you have two tanks they are 2- 20's or 25's.