1. Check engine coolant.
2. Check heater core.
3. Check electronic control valve.
4. Check thermostat.
The problem lies within one of these four possible issues. =)
The HVAC mode control switch bad, also check for HVAC FUSES.
The heater system contains 3 main parts. Heater control valve, heater core, and a blower. Does the blower Work? If not Check fuse, if good blower or switch are bad. Blower motor works, check heater control valve for movement when selecting from cold to hot temp.
Check for proper blend door operation.
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SOURCE: Where does the fuel filter go for a 96 chevy blazier 4 wheel dr
on inside of left (driver's side)frame rail, I hope this helps.
SOURCE: Replace heater core on a 96 chey lumina
http://wiki.answers.com/Q/How_do_you_replace_a_heater_core_on_a_Chevy_Lumina
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