Question about 1993 Pontiac Sunbird

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What are the steps needed to remove and replace the heater core

What are the steps needed to remove and replace an heater core for an 1994 pontiac sunbird 4 clynder 2.2 liter with no air condition

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REMOVE OR DISCONNECT

  1. Negative battery cable and drain cooling system.
  2. Raise vehicle and remove drain tube from heater case.
  3. Heater hoses from heater core and lower vehicle.
  4. Right and left sound insulators and steering column opening filler.
  5. Floor air outlet duct and heater core cover.
  6. Heater core mounting clamps and remove heater core.
INSTALL OR CONNECT

  1. Heater core and heater core mounting clamps.
  2. Heater core cover and floor air outlet duct.
  3. Right and left sound insulators and steering column opening filler.
  4. Raise vehicle and connect heater hoses to heater core.
  5. Drain tube to heater case and lower vehicle.
  6. Negative battery cable and fill cooling system.
  7. Check for leaks.

Posted on Apr 03, 2009

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  • 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.
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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.
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  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
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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.
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Removal & Installation


  1. Disconnect the negative battery cable.
  2. Drain and recycle the engine coolant.
  3. Raise and safely support the front of the vehicle.
  4. If necessary, remove the rear lateral transaxle strut mount.
  5. Detach the drain tube, then disconnect the heater hoses from the core tubes.
  6. Carefully lower the vehicle.
  7. Remove the console if equipped.
  8. Unfasten and remove the sound insulators, console extensions and/or steering column filler, as required.
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Unfasten the sound insulator retaining bolts ...

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... then remove the sound insulator

  1. On some models it may be necessary to remove the steering column opening filler.
  2. Remove the floor or console outlet ductwork and hoses.
  3. Remove the heater core access cover.
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Remove the heater core access cover

Unfasten the heater core mounting clamps/bolts, then extract the heater core from the vehicle.

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Unfasten the heater core retaining bolts; most later models are secured with clamps.

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Remove the heater core from the vehicle

To install:
  1. Install the heater core, then secure using the clamps/bolts.
  2. Fasten the heater core cover.
  3. Connect the outlet hoses and ducts.
  4. Install the sound insulators, console extensions and/or steering column filler.
  5. Raise and safely support the vehicle.
  6. Install the drain tube and connect the heater hoses to the core tubes.
  7. If removed, install the rear lateral transaxle strut mount, if removed.
  8. Carefully lower the vehicle.
  9. Connect the negative battery cable.
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You will need to pull the dash assembly away from the firewall slightly and remove duct work from heater case on right (passenger)side then the heater core cover,the 2 bands that secure heater core,drain cooling system,remove the 2hoses,and swop out old heater core.

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