Question about 1999 Cadillac DeVille

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Heater core went out need to know where it located

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The Heater core is behind the dashboard next to the evaporator.The dash needs to come out, then you can remove the evaporator/heater core housing.

Posted on Sep 26, 2009

  • Steven Kallhoff Feb 15, 2011

    Actually the dash doesn't have to come out, only one bolt on the right underside of it. I just pulled my heater core tonight on my '99 Deville in 1 1/2 hrs. and I'm not a mechanic. Pull out the glove compartment, the black cover underneath the glove compartment and you'll see the black plastic housing which has the little doors inside of it to direct your heat to where you push the switch. On the back right side of that housing you'll see a rectangular section butting up against the firewall which is where the core is inside of. Pull two small bolts off the front part of that housing (one bolt on top of the other). Pull the small metal rod up in the air to release it while holding the white plastic housing. You can now move the black housing around and disconnect another metal rod on the left side. There are several multicolored vacumn lines, you can stretch them to the back side of the housing. You should be able to rotate the housing while lifting it up in the rear and slightly pulling on the dash and it will fall out the bottom. You will now see the core. Remove the two bolts and it comes right out.

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SOURCE: 1999 buick heater core

the heater core is located in the heater case under the dash you need to remove the dash to remove the heater / a/c case to access the heater core

Posted on Nov 20, 2008

  • 12 Answers

SOURCE: 1988 Chevy Blazer Heater Core Replacement

first determine if the heater core is located high or low by raising the hood checking against the firewall {by following the heater hoses to the fire wall} if it is high need to remove the dash. if it is low get on your back and start removing clips and screws no special tool needed.

Posted on Feb 14, 2009

c17hydro
  • 2984 Answers

SOURCE: Where is the heater core located on 2000 Chevy Blazer?

Its located under the dash, just behind the glove compartment. From what I've read, you have to pretty much remove the entire dash to get to it.

Posted on Mar 11, 2009

  • 1596 Answers

SOURCE: Need to replace heater core. 91 Cavalier RS, 4 cyl., 2 litre

  1. Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System.
  2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.
  3. Remove the bolt connecting evaporator lines to evaporator.
  4. Remove the evaporator lines from the evaporator.
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  6. Disconnect the heater hoses from the heater core.
  7. Lower the vehicle.
  8. Remove the evaporator case drain tube.
  9. Remove the inside and outside module attaching bolts and the accumulator mounting bracket bolt.
  10. Remove the IP carrier.
  11. Remove the floor air outlet.
  12. Disconnect the wiring harness from the HVAC module assembly
  13. Disconnect the electrical connections at the following locations:
  1. Remove the HVAC module assembly screw (2) at the top of the module from the mounting bracket. (1).
  2. Disconnect the gray source vacuum line (1). IMPORTANT: DO NOT tilt HVAC module assembly or coolant may leak out.
  3. Remove MODULE from Vehicle

Posted on Jul 28, 2009

  • 82 Answers

SOURCE: need to replace heater core in 1993 buick. water

the core is under the middle of the dash - look in under hood - you will see 2 aluminum pipes going behind motor into firewall - these are a/c lines - close to this you will also see 2 black hoses about thumb size - these are the heater hoses to the heater core - the dash might have to come out to get heater core from a/c fan housing

Posted on Sep 21, 2009

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1 Answer

Need to know where my Heater Core hoses hook up to on the engine? I see the Hoses but is there a seperate part that the hose connects to?


The best way to locate a heater core hose is to determine where the heater core is located. Many vehicles have the heater core inside the dash. Other vehicles, usually larger vans and trucks, will have a heater core box inside the engine compartment. Once you have determined where the heater core is located in your vehicle, that will allow you to easily locate a heater core hose. If the heater core is inside the dash, you'll need to examine the firewall for the hoses. If it is in a heater box, you'll need to look around the engine compartment for the box.




Heater cores located inside dashes can be very difficult and time consuming to replace. Depending on the layout of your engine compartment, it can also be difficult to locate a heater core hose. If there is very little clearance between the engine and the firewall, you may have difficulty finding the hoses. You might need to use a flashlight to look from the underside in some cases. You will typically be able to identify the heater hoses where they enter the firewall by looking for two two small diameter hoses that protrude into the engine compartment. You can then trace those hoses to their other ends, where they will typically connect to a thermostat housing, the radiator, or a t-connector.


Hope this helps.


know more about your car

Sep 12, 2012 | 1996 Lincoln Town Car

1 Answer

How to remove the heater core


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.

Dec 24, 2010 | 1993 Honda Accord

1 Answer

I need to know how to replace the heater core, is it something i can handle or do i need to take it somewere?


usually not that hard on an older GM. locate approx location of heater core by looking for two matching size water lines that enter the passenger compartment thru the firewall from the engine compartment. go inside under dash and look for the heater core box. remove screw to open and expose the heater core

Sep 08, 2010 | 1993 Buick LeSabre

1 Answer

Heater core bloackages possible and need to know how to remove core to inspect


usually located under passenger side under dash board hoses ae in motor compartment firewall you'll see 2 hoses that must be loosen to et antifreeze out of core instead of letting it drain inside your car but core is under dashboard next to heater blower or right over heater blower every car is different im just letting you know were it is good luck

Mar 15, 2010 | Pontiac Grand Am Cars & Trucks

1 Answer

Problems with locating heater core in 1997 oldsmobile achievea


U must remove the entire dash to service the heater core, once the dash is out then the heater core case must be split to get core out.

May 19, 2009 | 1997 Oldsmobile Achieva

1 Answer

1988 Chevy Blazer Heater Core Replacement


first determine if the heater core is located high or low by raising the hood checking against the firewall {by following the heater hoses to the fire wall} if it is high need to remove the dash. if it is low get on your back and start removing clips and screws no special tool needed.

Feb 14, 2009 | 1998 Chevrolet Blazer

1 Answer

Need to replace heater core on 71 carpice


Yes he has to drain the system. It is located at the bottom of the dashboard. If looking into the engine compartment, you will see whre the hoses connecting to the heater core go into the cab at the back firewall.The heater core is just inside the cab.

Feb 08, 2009 | 1978 Chevrolet Caprice

1 Answer

Where are the heater core hook ups


The heater core is located on the passenger side of the vehicle. If this has been bypass the core is surely leaking. The heater core pipes should be visible from un der the hood, passenger side of vehicle towards the firewall. keep me posted, and keep an eye on that heater core, there is reason for the prior owner not to have heat.

Dec 19, 2008 | 1991 Oldsmobile Ninety Eight Regency

1 Answer

1999 buick heater core


the heater core is located in the heater case under the dash you need to remove the dash to remove the heater / a/c case to access the heater core

Nov 20, 2008 | 1999 Buick Regal

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