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.
On all chevys that year 1979-1988 It's Not Fun. Step 1. Remove heater hoses from core under hood. 2. Remove glove box door inside. 3. Take off all 5 heater mounting nuts under the hood. 4.Remove defroster hood on front of heater inside . 5 Gently pull heater unit back and down. 6. Remove all control cables from heater and mark them. 7. Then you can take heater core out of heater casing by removing 4 srews from case where core is. 8. remove front and back retainer straps from core. Reverse to put it back in.
You have to take out the whole heater and air condiasioning system out and replace the new heater core in. When you replace the heater core, you firset have to put the air condiasoning system in then the heating system/ heater core. When you take the old systems out, you first have to take out the A.C then the heater.
You first have to drain the radiator, then you diconnect the heater hoses to your heater core .in the engine compartment. Then you remove the cover off the heater core assembly under the passenger side , under the glove box. Then you take straps off the heater core off. and replace . Install every thing you removed previously and refill your radiator and your done.
It IS a bit of a pain in the $#&(... You have to pull the plastic shroud that is around the heater box under the dash so that you can expose the heater core. ONLY THEN, after the heater core is exposed do you go under the hood and pull the heater hoses and the three or 4 nuts that hold the heater core in place. But the plastic shroud is the difficult part. You might want to see if you can locate a set of dagrams.
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