Question about 1994 Oldsmobile Cutlass Ciera

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Heater Core leaks

My husband is trying to replace the heater core in his 94 olds cutlass ciera, V8. He has dash patially apart, but can not figure out how to get to the heater core. He has read that he needs to be careful of the airbag sensors, but he has no idea where they are or what they look like. It is the middle of winter and he has no heat. Any suggestions? He has Haynes manuel but it seems that there are steps missing.

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You can get a Chilton Manual from your Library. The Chilton has Better Instructions than the Haynes Manual. Please Rate my Solution, I need all the Help that I can Get! Thanks!

Posted on Jan 29, 2009

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1 Answer

Only warm air comes out of heater on 89 cutlass ciera core blew out, new thermostat what controls air temp in heater system. Lever moves from cold to hot easily but can't tell if it moves anything under...


#1 Listen if you hear the blend door flap open and close if you do then working good.

#2 run car to normal temp and touch both heater hoses and make sure temp is similar if one is hot and the other warm then your heater core is clogged and most likely that can be the problem it build lime from having tap or well water in coolant system distilled water is recommended but who uses that.

#3 run car when cold with cap off @ 2k rpm and top off radiator. Then close cap and continue to rev @2k until normal temp if heater hoses are not equal in temp heater core clogged.

Jan 22, 2015 | 1989 Oldsmobile Cutlass Ciera

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98 caddy deville nothstar v8 how to replace heater coil have no heat and I'm loosing water somewhere


the heater core in a 1998 Cadillac is very tricky to replace.
start with getting a pressure test to determine where the exact location of the leak is, it may not be the heater core.
if you do decide to pull the dash apart to change the core make sure the battery is disconnected for at least an hour to allow the airbag system to discharge.

Oct 11, 2012 | 1998 Cadillac DeVille

1 Answer

Where is the heater core located


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 13, 2010 | 1988 Oldsmobile Cutlass Supreme

1 Answer

I need a simple way to change the heater core in a cutlass supreme.


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 08, 2010 | 1996 Oldsmobile Cutlass Ciera

2 Answers

Replace heater core


Inspect/Replace 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 04, 2010 | 1995 Oldsmobile Cutlass Ciera

1 Answer

I need to install a heatercore on a 92 olds cutlass 3.3 engine not sure howto install need instructions on removal and replacement.


  1. Disconnect the negative battery cable and drain the cooling system.
  2. Disconnect the heater hoses from the heater core inlet and outlet connections in the engine compartment.
  3. Allowing residual coolant from the heater core to drain. Cap the openings.
  4. Working inside the vehicle, remove the lower instrument panel sound insulator and look for where the air blows to your feet.
  5. Remove the heater floor outlet duct screws or clips and remove the duct.
  6. Remove the heater core cover by removing the attaching screws and clips.
  7. Remove the heater core cover.
  8. Remove the heater core retainers and remove the heater core
  9. Reverse order to install leaving the covers off at first then connect all hoses, refill and check for leaks before putting covers back.

Jan 17, 2010 | 1992 Oldsmobile Cutlass Ciera

1 Answer

How do you replace the heater core of a 1996 cierra wagon 6 cyl


  1. Remove air cleaner and duct assembly.
  2. Drain coolant.
  3. Rotate engine forward on 3100 only.
  4. Both heater hoses at heater core.
  5. Right and left instrument panel sound insulator.
  6. Rear compartment heat duct adapter bolt/screws and adapter.
  7. Heater outlet duct bolts and duct.
  8. Heater core cover.
  9. Heater core.

Dec 26, 2009 | 1996 Oldsmobile Cutlass Ciera

1 Answer

Remove and replace heater core . It has air conditioning. It is a SL model.


first off, drain your coolant.

1. under your hood, loosen clamps and remove hoses from your heater core that go into your firewall.
2.
take off your dash board panel on the inside.
3. take off the vent of duct
4. take off screws and clips on the heater core cover and remove that
5. take off the straps that hold the core in place and remove. Watch not to lose too mauch, if any coolant in the core itself.
6. install new core. Please ratey answer so that I know if I was of any help to you. Thanks!

Dec 19, 2009 | 1989 Oldsmobile Cutlass Ciera

1 Answer

Air will not get hot


Try flushing the heater core with a garden hose.

Mar 14, 2009 | 1994 Oldsmobile Cutlass Supreme

1 Answer

Anti freeze is deposited on my windshield when heat is turned on


You may have a leak in the heater core or the hoses to the heater core located under the dash. check to see if there is any moisture under your dash in the carpeting.fix the leak, and you will fix the cause of antifreeze on the windshield.

Feb 03, 2009 | 1991 Oldsmobile Cutlass Ciera

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