SOURCE: 1994 CHEVY BLAZER W/AC S10 HEATER CORE
Follow thiws link for instructions:
http://wiki.answers.com/Q/How_do_you_replace_a_heater_core_on_a_1994_GMC_Jimmy
SOURCE: 1999 S10 Chevy truck
you will have to remove the dash assembly and then the heater/a/c box it is in the hvac module.
SOURCE: 2001 Chevy s10 with no heat
If you are certain there is no air in the coolant system, then there is a chance that the blend door motor is not working or the heater control assembly is bad. since you have replaced your own heater core you probably noticed the the doors inside the heater core housing. One of those doors is controlled by the "hot/cold" knob. The motor on that door could bad.
SOURCE: replace a heater core in 2000 chevy blazer
it is located under the dashboard against the firewall of the passenger seat. i recomend buying a repair manual from your local auto parts store before attempting as it requires draining, flushing, refilling and bleeding the cooling system as well as removing many other componets like the entire dashboard and thermostat
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