Big job, below is a link(video of doing the job on a Buick) very similar to your car, press the helpful button, good luck
How to change heater core on 1995 Buick LeSabre
Very informative really need a video on how to remove the heater core out of the car don't know how to remove dashboard cover or heatercore cover.
How to Replace the Heater Corein a Chevy Impala
Replacing your Chevy Impala'sheater core is no easy task. There are several parts you must carefully removeor reposition to disconnect the core from the heating, ventilating and airconditioning (HVAC) module. This module and the core are located behind thecar's floor ducts.
1. Jack up the car and drain the Impala's cooling system.Loosen the water pump's drain bolt and let the coolant drain into a pan. Closethe drain bolt and lower the car afterward.
2. Remove the heater outlet and inlet hose from theheater core (reposition the hose clamps to do so). Take off the right consoleextension panel, body control module and left side extension panel on the frontfloor console
3. Disconnect the leftinstrument center support bracket (pull away the carpet at its bottom to reachthe nuts). Remove the accelerator control pedal from its position in the frontof the dash.
4. Disengage the center floorducts by raising the outlet duct while pushing the ducts down. Rotate theoutlet duct forward in the car and pull down to remove it from the HVAC module.
5. Use a small chisel to removeall the heat stakes from the heater core cover. Loosen the nut behind the fuelline bracket. Remove the dash panel's stud at the heater hoses.
6. Pull the core's cover downenough to reach the HVAC module's locating pins. Slide the cover rearward untilthe drain tube clears the dash front. Remove the cover by sliding it down,rearward, and to the right. You can now remove the core.
Installing the New Core
1. Install the new core into the HVAC module,attaching a new seal onto the drain tube. Attach the core cover from the rightside, sliding it up and forward into position.
2. Align the draintube with the front dash hole and the core cover holes with the HVAC locatingpins. Install the core cover screws, cutting and folding back the soundinsulator near the center screw to ease that screw's installation.
3. Reinstall the dash panel stud at theheater hoses, tightening the nut behind the fuel line bracket. Align the centerfloor duct with the HVAC and push it up while rotating rearward to install it.Put the floor ducts and outlet duct back into the Chevy Impala.
4. Attach theaccelerator control pedal. Pull the carpet back and position the left centersupport bracket, then tighten the bracket nuts.
5. Reconnect theleft side front floor console extension panel and the body control module tothe car.
6. Put on the outlethose and inlet hoses to the core, securing them with their clamps. Refill thecooling system with the proper mixture of water and coolant.
Read more: How to Replace the Heater Core in a Chevy Impala ' eHow.com
SOURCE: Heater core instructions for 04 Chevy Impala SS
Before you go thru that expense. If it is water leaking,check the evaporator. Sometimes it gets plugged with debris. So first, decide if it is water or anti-freeze. Also, I have taken the heater hoses off of the inside of the motor area and flushed the core out. It works on some.
SOURCE: how do u replace a heater core on a 1994-1996
That is usually a worst case scenario. Most of them just need to be flushed from the engine side. Unless it is leaking into the passenger side of the car, you probably only need to run a garden hose thru the inlet and outlet pipes to the core on the engine side of the firewall. Then you must bleed the air out of the system with the bleed valve located near the water pump/Optispark as you refill with green standard antifreeze. Try to choose one without silicone and absolutely under NO circumstances use the manual recommended Dex-Cool.
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