Question about 1997 Pontiac Grand Am

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Replaced the heater core. now i cant get good heat

1997 pontiac grand am. the heater core started leaking last summer so i disconnected the hoses and joined them with a coupler to get me by til it got cold.now after putting in a new heatercore i only get luke warm heat if the engine is at normal operating temp and not moving.once i start driving it gradually blows colder and colder

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  • Anonymous Feb 22, 2009

    REPLACED HEATER CORE AND ENGINE HEAT COMES OUT BUT BLOWS COLD ON FLOOR

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When u put the heater core back either you mixed up the A/c controls with the heater control, or the gate that allows air across you heat ex. is not opening.
Feel the temperature of the water going in and out of the heat ex. (open the hood and feel down by the firewall where the pipes go thru)

If it isnt hot going in there is a valve problem not allowing water to circulate.
If both are hot, then the blower gate isnt opening or the A/c control is confused with the heater control. ( a bit unlikely)
Hope that helps

Posted on Jan 13, 2009

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The heater control valve is likely crusted shut ...replace that and any hoses that where crimped for a long time to heater core and backflush system with heater open full...also be sure head units cables vacuum lines and electrical were not disturbed when you tore out heater core

Posted on Jan 13, 2009

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1 Answer

Heater hose bypass


I'm guessing you have a bad heater core? To bypass this, you can disconnect hoses from the heater core. You may be able to do this from under the hood or under the car, but it may also be under the dash. IWhen you get these disconnected, you can use a piece of copper tubing or something the sameput the copper tubing into the ends of the hoses joining them together, bypassing the heater core. If it's your heater hose gon, you can cut it shorter by the leak but it is all best to replace rather than hack. Good luck with it. I hope that is what you maen't

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Need to know how to bypass my heater core for the summer


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Take the heater hoses off the heater core at the firewall and join them together with a barbed fitting and a couple of hose clamps. That will do it...Mike

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Had heater disconnected...need to hook it back up. anyone know how?


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I need to install a heater core for a 2001 Pontiac bonneville I need instructions on how to remove and install it.


prev.gif next.gif HEATER CORE REMOVAL AND INSTALLATION 1997–01 Models BONNEVILLE AND LESABRE
  1. Disconnect the negative battery cable.
  2. Drain the cooling system into a clean container for reuse.
  3. Remove or disconnect the following:
    • Heater hoses from the heater core
    • Right sound insulator
    • All necessary electrical connectors and remove the instrument panel compartment
    • Temperature valve actuator
    • Electrical connector and remove the HVAC programmer
    • Heater core cover-to-heater assembly screws and the cover
    • Heater core-to-heater assembly screws and the heater core Fig. 1: View of the heater hoses and clamp positions — 1997–01 Bonneville and LeSabre 93111g71.gif
      Fig. 2: View of the heater core cover — 1997–01 Bonneville and LeSabre 93111g72.gif
    To install:
  4. Install or connect the following:
    • Heater core and the heater core-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm)
    • Heater core cover and the cover-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm)
    • HVAC programmer and connect the electrical connector
    • Temperature valve actuator
    • Instrument panel compartment and connect any necessary electrical connectors
    • Right sound insulator
    • Heater hoses to the heater core
  5. Refill the cooling system.
  6. Connect the negative battery cable.
  7. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

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Describe how to bypass a heater core in a 97 Dodge Dakota plz.


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Replace heater core in 1994 pontiac grand am


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.

Nov 13, 2009 | 1994 Pontiac Grand Am

2 Answers

Cant find heater core hose


The heater core hoses go into the firewall area on the passenger side of the engine compartment,But I think you should look for the leak by adding water and with the engine running,watch to see if you can locate the leak,the location you are describing sounds more like a freeze plug or even the head gasket,But look and see first.


Please rate this a fixya

Feb 01, 2009 | 1995 Pontiac Grand Am

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