[Shotimes] Heater Hose

[Chris "Zap"]

    The '95 has sprung a coolant leak, now leaving us without a car ('94 is
STILL being worked on).  I'm curious if anyone has replaced the heater hoses
before.  I'm having quite a time getting the darn bolt that holds the line
to the block off.  Also, does the whole assembly (rubber hose crimped to
metal line) get replaced or is it more common just to get a new rubber piece
crimped onto the end?  I'm not sure if I'm dealing with the inlet or outlet
hose, it is the left one going into the firewall.  Maybe in the process I
will replace the thermostat as well, since the system is already drained.
Also, there is a sensor in the middle of this metal line, can anyone tell me
which one it is?

Thanks,
Chris