It's never the same thing. http://www.automotiveforums.com/t151764-help__no_heat_in_94_accord_lx.html for example. What you need is your model's service manual so you can see how to get in there to exercise the parts and find what is stuck.
'94 Accord LX, the temperature control cable itself is clamped in properly, but it won't slide into the casing.
If I push hard the cable slides in a bit but the second I let go the cable pushes itself back to max cold position.
Any help would be greatly appreciated.