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Do I have to take the entire dash out to install a heater core for a 1985 eldarodo cadillac

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Most older cars , you didn't have to. You can get a manual for this at Alldatadiy.com. Might even check out the library first. Old Motor manuals.

Posted on Dec 21, 2016

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Don't know about a 85 eddy but I did a 89 caddy and the heater core was in a plastic bump out box in the engine bay , it was a clamshell type enclosure held with 5/16 bolts all around it , I did have to move the ac core out of the way to reach it so I did have to recharge the ac system afterwards but I did manage to get it out and back in without any work under dash , look 4 it hope yours is the same way !!!

Posted on Dec 21, 2016

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1 Answer

How to install heater core for a 1995 Cadilac Deville 4.9L


you must remove the clamps from the heater core from the engine compartment and the covers from under the dash to be able to remove the heater core

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If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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1 Answer

Heater core


This will require to remove the dash to get access to the heater core. After the whole dash is apart access to the heater core is easy and self explanatory

Feb 24, 2010 | 1991 Cadillac DeVille

1 Answer

How do you replace a heater core in a 1991 Cadillac Deville? What all has to be removed in order to remove the heater core? What does the heater core look like and how costly is this if taken to a shop?


well i remember that wonderfull day when i got my first heater core job at the Dealer it was a 91 deville. lets just say u never are a happy person when you have to pull the entire dash asm atleast back on the passenger to get the hvac case out of the car. if you havent done anything near that i would say it would take you maybe a few days to a week to finish it. icould do them now in about 6hr-8hr. so the dealer would charge about 1100-1300 bucks. ill do the job 4 6 hundred/ 562/587/8001

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I do think you have to pull he dash, for that you will need a manusl, try ebay for used factory manuals, I have had good luck getting them there for all my cars.

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