If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
The heater housing is disassembled to get to the heater core.
Heater Core
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.
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: 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: Replace heater core in 1988 Ford Ranger
allow the system to cool down
take radiator cap loose to release pressure
once pressure is released tighten cap
loosen clamps on the heater hoses in the engine compartment on the pass. side of firewall.
plug or cap off the heater core tubes to prevent spillage when you pull it into the truck
place a trash bag on floorboard in case spillage occurs
remove the five screws holding the heatre core access cover, three on top and two on bottom
carefully pull heater core back and down and remove it from the dash
install is reverse
Hope this helps
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