Heater core would be your best bet, also check to make sure that the door inside the ductwork is actually moving from the cold air side the the hot air side. If you have the manual lever you should be able to feel it moving, if it's vacuum operated you should hear the air flow change as the door is moved.
i have a 2000 s10 4x4 the 4x4 does not work ihave checked the fuses all good i have power to the...
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i have a 2000 s10 4x4 the 4x4 does not work ihave checked the fuses all good i have power to the switch on the dash coming in none coming out unless you hold the button in but this does let thje 4x4 kick in i have no power at tranfer case does it have arelay and where i need wiring diagram for this
battery failure indicator came on, battery going flat and fuel level and gas guages became...
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battery failure indicator came on, battery going flat and fuel level and gas guages became inoperative atthe same time - related fuses appear to be okay