Question about 1994 Pontiac Grand Am

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How do I change the heater core in a 1994 Grand Am?

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  1. Unless your coolant has spilled into the driver/passenger compartment first you must drain the coolant out of the hoses and then you must remove the shifter console.
  2. Directly behind the console just below the radio you should see a square shape plastic box wich contains the heater core you must open the box by unscrewing or unsnapping the fasteners be patient it's going to get a little tight but you can do it without having to remove the entire dash.
  3. Pay attention to how it's set up inside the box and just diconnect the old unit and replace it with the new, remember to retrace you steps when putting it all back together, it should take you about 1-2 hrs.
  4. Don't forget refill your coolant and in most cases you have to have your A/C unit recharged after doing a heater core replacement.
  5. Call your local auto-parts store and verify the A/C unit having to be recharged only if your vehicle comes with an A/C unit installed(good luck).

Posted on Sep 25, 2009

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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.
  10. Fill cooling system and check for leaks. Start the engine and allow to come to normal operating temperature. Recheck for leaks and check coolant level. Add if necessary.

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It sounds like either the heater valve which may be located inline with a 5/8" hose or 3/4" hose or the heater core is leaking, a heater core is like a small radiator.

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Bad news. You will have to remove the entire dash board to replace that heater core. Sorry

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