If the engine is reaching normal temp, and both heater hoses are getting hot, the problem could be a blend door under the dash or the controller.
SOURCE: 1994 buick lesabre heater core removal
The heater core is located under the dash, in the center. The container holding the core looks like a black plastic box. Remove the ash tray for easier access. You may have to also remove some other covers under the dash. You must first drain the radiator then you have to disconnect the hoses. There are two hoses connected to nipples of the heater core that go thru the center of the firewall. Remove the screws that hold on the cover to the heater core. Then you should be able to get the old one out. There might be a couple of other minor steps but I'm sure you can figure them out. For re-installation just go in reverse order to put it all back together.
SOURCE: 2002 subaru legacy heater not working
heater core could be plugged,try removing both heater hoses to core and back flush
SOURCE: went to dealership to repair heater core on 2002
the water pump pumps the antifreeze witch flows through your heater core. if the water pump is shot your car would over heat. BUT i have never heard of water pump failer due to a system bleed? did they give you a reson for the timing belt.
SOURCE: bleed coolant system
Old methos id to leave the raditor cap off and squeeze the coolant hoses to get the air out.
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