SOURCE: replace heater core 1994 chevy g20 conversion van
Here a are the instuctions to remove it. I did not know if you have A/C or not so I included both for you.
REMOVAL & INSTALLATION
Without Air Conditioning
ALL MODELS
See Figure 1
CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
To install:
1990-95 MODELS With A/C
To install:
SOURCE: heater core
You have to pull the dash and all the lower fascia, then remove the box that houses the Heater Core Take the clamps off the heater hoses from the engine compartment side of the firewall and disconnect the heater hoses. Disconnect the bracket that holds the heater core in place from the inside of the passenger compartment (if present.) Carefully remove the heater core and discard it. Install a new heater core reversing the above steps.
SOURCE: 1994 buick lesabre heater core removal
The heater core is located under the dash, in the center. The container holding the core looks like a black plastic box. Remove the ash tray for easier access. You may have to also remove some other covers under the dash. You must first drain the radiator then you have to disconnect the hoses. There are two hoses connected to nipples of the heater core that go thru the center of the firewall. Remove the screws that hold on the cover to the heater core. Then you should be able to get the old one out. There might be a couple of other minor steps but I'm sure you can figure them out. For re-installation just go in reverse order to put it all back together.
SOURCE: 1994 CHEVY BLAZER W/AC S10 HEATER CORE
The link below helped with mine and has pictures as well. Good luck!
http://www.sytyarchives.com/howto/viewarticle.php?article_name=heater_core.php&dir=climate_controls
SOURCE: How to replace a heater core in a 1994 chevy 1500
As with all vehicles it seems the first part that they build around is the heater core. It is under the dash above the floor housed in a black plastic sealed box. Sealed with goop. Locate that box and start removing everything around it that is peventing taking the cover off. Of course disconnect the heater hoses under the hood a thefirewall.
Warning it is never as easy as it sounds.
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