2002/2003 subaru outback does not have one!!!!!!!!
http://techinfo.subaru.com/html/downloadFree.jsp?doc_id=139054
Heater inlet hose on a 99 subaru legacy is on the passenger side coming out of the fire wall. One of only 2 hoses coming out of the fire wall.
I have not tried to install a seat heater. Assuming that you have a seat with heater that you wish to use, Subaru tends to not include the wiring unless that option was ordered from the factory. You will need to install all wiring up to the fuse panel.
Since they no longer make a 2001 Subaru Outback, it depends on whether yours was equipped with one. It was an option so if you are asking if every one had a block heater, the answer is "no".
could be the blower motor, a fuse, or a bad wire.
In Subarus the temp control for the heater does not control the coolant flow, just airflow past the heater core. If you get no heat, there is no coolant in the heater core -- either there is no coolant or it is not circulating.
See "Fuses and Circuits" on page 6 in chapter 12 "Specifications" of your "OWNER'S MANUAL".....
The light in the switch can not be changed, the whole switch would need to be replaced.
replace heater core. replace fan.
No mention of a block heater in the service manual. It appears that they install heaters on the left side rear of the engine. Of course this type of heater plugs in to household power so if you have one it should be fairly easy to find the cord/plug and trace it back to the heater.
It's in the window in the rear cargo area on the wagons. It looks like a window heater or something. We get horrible reception with it. Looking into putting an external antenna on ours.