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If you are talking about the wires that run to the backside of the fuse block than I would bet that one of them is burnt up. Pretty common for Saturn. If you remove the block connectors, There are two and they are bolted to the backside of the fuseblock, and inspect the pins and wiring you will probably find a burnt pin and terminal. The fuseblock is usually replaced and a block connector repair kit is installed. Both use to be available from saturn, they may still be available through GM. You may have to get one from a salvage yard.
If your thinking of interchanging the head or short block then you can, depending on the cylinders, because the saturn sl2 2000 and 1999 were one of the few models ever to make a 1.9 liter DOHC. if you have a 1.8 DOHC then you should be fine with a 2001 or 2002
The most likely problem is a stuck heater switch. follow the heater hoses from the firewall to the engine block, somewhere along those lines will be a switch that allows the warm coolant to pass through the heater core. place your hand on both sides of the switch with the car warmed up, if the side towards the block is warm and the side towards the heater core cool then replace the switch.