Have replaced my heater core in my 2001 regular cab 4wd in december 2009. Had to pull the complete dash including the complete metal dash behind the dash that you see. Also had to remove the right passenger side inner fender well to acess the remaining two bolts that hold the heater core cover to the firewall. Its an insane job to do but the repair shop books call for 9 1/2 hrs to do the job. I'm not an expert but this is what it takes.
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Re: replacment of heater core on 01 chevy S-10
U don't have to pull the dash.
Drain Coolant, Remove kick panel and center lower trim plate by pulling outward. Remove outer floor air duct. Remove the heater/vent module. Remove the heater core access cover screws. Remove the heater core access cover. Remove the heater core from the heater/vent module
To Install: Install the heater core to the heater/vent module. Install the heater core access cover and screws to the heater/vent module. Install the heater/vent module assembly to the vehicle.
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No you do not, I think you mean the heater core, because its leaking, first unhook heaters hoses under hood (there may be a clamp on the core tubes that has to come off), next go under dash on passengers side, take the one bolt to the far right under dash by the dome light, thats so you can pull the dash out just enought to get the cover off the front of the heater box, behind that cover is the heater core, now that cover is held on with about 6 1/4 inch screws give or take 1 or 2 when you get the cover off you will see 2 straps, one on each end that hold the core in place, there are 2 1/4 screws in each one, remove them and core will come out. Put back together in reverse order.
Remove the front dash panel by turning the lower screws in a
counter-clockwise direction, then unscrewing the single bolt on the lip
of the instrument cluster and pulling the panel out. Remove the rear
wiper switch and the 4x4 switches, if applicable. Lowering the tilt
wheel will allow the panel to be totally removed.
Remove the radio, headlight switch module and glove box by turning their screws in a counter-clockwise direction.
Remove the main dashboard by unbolting it at the front, between the
windshield and firewall. There are six to eight bolts holding it in,
and, once they are removed, the dash can be pulled away from the
firewall. Be careful not to pull too much, as the wiring harness could
Drain the coolant system by turning the drain plug on the lower left
corner of the radiator and allowing the fluid to fall into the drain
pan. Uncapping the radiator can reduce the internal pressure.
Remove the heater core hose, on the upper left of the engine bay by pinching their hose clamps with a pair of pliers and pulling them
off. Some models will have screw-type hose clamps; turning them
counter-clockwise will loosen them. Age and heat may have stuck the
hoses to the core nipples, and the hoses can be cut right at these
nipples if necessary. Leave enough hose to reconnect the new core.
Unbolt the heater core's mounts with a socket wrench in a
counter-clockwise direction. Once the bolts are free, the heater core
can be maneuvered toward the windshield and slid out. Some coolant may
splash out, so have a towel handy.
Replace the heater core with a new one by sliding it into place and securing the mounting bolts.
Reconnect the heater core's hoses, turn the radiator's drain plug
clockwise to close it, then refill the coolant system with a 50/50
percent mix of coolant and water.
Reconnect the dashboard to the firewall, then replace the front dash
panel and fasten its instrument cluster screw and bottom bolts.
Crank up the Jimmy and add coolant until the heater core is filled and blowing hot air.
Replace the radiator cap.
Good luck and make sure you have lots of time and use the camera on your cell phone and take pictures to use as reference.