Question about 1997 Oldsmobile Achieva

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Coolant leaking out of heater core drain tube

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  • Expert
  • 87 Answers

The core is bad. You're lucky you have a catchpan and drain in your car... most people end up with coolant all over their feet when this happens! You have a few options. 1. You can pick up a bottle of cooling system leak stopper (available at Wal Mart and auto parts stores), follow the directions and see if that stops the leaking. 2. You can cut the heater lines and bypass the core entirely (obviously this is only a good idea if you live in Arizona or some other warm place). 3. Replace the core.

Posted on Jun 15, 2009

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Is the coolant leaking or just water? If it is coolant then the heater core is leaking. If it is just water then it is A/C drainage which is normal

Posted on Jun 15, 2009

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Posted on Jan 02, 2017

Ajkill
  • 2035 Answers

SOURCE: Heater Core

Please use this link its the service manual for the car :

http://www.autozone.com/addVehicleId,2395002/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152800a9227


Good luck...

Posted on Aug 08, 2008

wavoconqueso
  • 57 Answers

SOURCE: Heater core burned out and I want to bypass the coolant hoses.

Without knowing your car specifically I can suggest the generic way to do it. Locate the two heater hoses going into the firewall, probably on the passenger side. They're the ones that get hot and are about an inch + in diameter. Disconnect. Measure the inside diameter of the hose and purchase a short piece of galvanized or copper pipe (6 inches) at Home Depot. Connect both ends of the hoses to the pipe to form a loop. Secure the hoses so they don't land some place that would cause a problem.

I had this problem on an 85 Tbird. I had heard about a product called Bars Leak and tried it. It worked. No leaks and I kept my heater. You should be able to find it at any parts place at less than $10. Ground black pepper also has worked for me.

Posted on May 09, 2009

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Water leaking onto passenger side floorboard,soaking the carpet


Your heater core has developed a leak - the wetness on the passenger side carpet is engine coolant
from a heater core leak, or a leak in one of the two hoses connected to the back of the heater core.
Your strategy: disassemble dash down to heater core, determine whether you'll need a new heater
core or new hose (or new hose clamp), then replace the offending part.

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Water leaking out of overflow from heater core.


If coolant is leaking from the heater core into the interior or through a weep hole out of the car your heater core has sprung a leak.
Most vehicles have easily accessible heater cores, only requiring removal of a panel under the dash or hood to gain access. On the '97 Skylark it's accessible under the dash.
  • Disconnect the negative battery cable.
  • Drain and recycle the engine coolant.
  • Raise and safely support the front of the vehicle.
  • Detach the drain tube, then disconnect the heater hoses from the core tubes.
  • Carefully lower the vehicle.
  • Remove the console if equipped.
  • Unfasten and remove the sound insulators, console extensions and/or steering column filler, as required.
  • Remove the floor or console outlet ductwork and hoses.
  • Remove the heater core access cover.
  • Unfasten the heater core mounting clamps/bolts, then extract the heater core from the vehicle.


To install:
  • Install the heater core, then secure using the clamps/bolts.
  • Fasten the heater core cover.
  • Connect the outlet hoses and ducts.
  • Install the sound insulators, console extensions and/or steering column filler.
  • Raise and safely support the vehicle.
  • Install the drain tube and connect the heater hoses to the core tubes.
  • Carefully lower the vehicle.
  • Connect the negative battery cable.
  • 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.

Feb 28, 2011 | 1997 Buick Skylark

1 Answer

There is a drain tube on the fire wall that is leaking


this drain tube is designed to drain water that drips off of the evaperator core during a/c operation.even though it is winter your a/c will still come on during defrost operation to dry the air. if you are leaking pure water out of it it is normal. if oil is leaking out of it the evaperator core has leak. if coolant is leaking out of it the heater core is leaking.

Jan 19, 2011 | 2004 Chevrolet Silverado 2500HD

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Car is leaking coolant from a rubber L shape pipe coming out of the fire wall


The L shaped pipe you are talking about is the drain tube to your heater box for the airconditioning. In the same box is the heater core that carries antifreeze for the heater. If there is coolant leaking from the drain then the heater core is leaking and needs to be changed.

Oct 27, 2010 | 1998 Chevrolet Cavalier

1 Answer

Coolant leaking outside cab on firewall


Hello and welcome. this would be a heater core leaking. the heater core sets inside the a/c box behind the dash. there is a drain tube that sets in the firewall. when the heater core leaks, it will drain out this drain tube

Sep 28, 2010 | 2001 Chevrolet Silverado 1500

1 Answer

How to remove heater core from buick cintury 1995


With Air Conditioning
CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  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.
  5. Remove the heater floor outlet duct screws or clips and remove the duct.


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Remove the heater floor outlet duct screws or clips ...


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... then remove the heater floor outlet 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.


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Remove the mounting bolts which retain the heater core

To install:
  1. Position the heater core in the housing and install the retaining straps.
  2. Position the heater core cover on the housing and install the attaching screws and clips.
  3. Install the floor outlet duct and attaching screws or clips.

0aed66b.gif
Exploded view of the heater core and case assembly

  1. Install the lower instrument panel sound insulator.
  2. Working in the engine compartment, connect the heater core inlet and outlet hoses.
  3. Fill the cooling system.
  4. Start the engine and check for coolant leaks. Allow the engine to warm up sufficiently to confirm the proper operation of the heater.
  5. Recheck for leaks. Check the cooling system level.
  1. Drain the cooling system.

72f974e.gif
Heater and air conditioning module assembly

CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.


  1. If equipped with a diesel engine, raise and support the car on jackstands.
  2. Disconnect the hoses at the core.
  3. On diesels, remove the instrument panel lower sound absorber.
    1. Remove the heater duct and lower side covers.
    2. Remove the lower heater outlet.
    3. Remove the two housing cover-to-air valve housing clips.
    4. Remove the housing cover.
    5. Remove the core restraining straps.
    6. Remove the core tubing retainers and lift out the core.
  4. To install:
    1. Install the core, then attach the core tubing retainers.
    2. Attach the core restraining straps.
    3. Install the housing cover, then install the two housing cover-to-air valve housing clips.
    4. Install the lower heater outlet, then attach the heater duct and lower side covers.
    5. On diesels, install the lower instrument panel sound absorber.
    6. Connect the hoses at the core.
    7. Lower the vehicle if raised and supported.
    8. Fill the cooling system.
    9. Start the engine and check for coolant leaks. Allow the engine to warm up sufficiently to confirm the proper operation of the heater.
    10. Recheck for leaks. Check the cooling system level.

Mar 07, 2010 | 2000 Buick Century

1 Answer

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.
2a4e97b.gif
Unfasten the sound insulator retaining bolts ...

7ed3765.gif
... 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

3 Answers

Coolant leaking at back of engine,could it be the heater core


the heater core leaks inside the car, it is either a hose or a core plug.

Sep 30, 2009 | 1994 Toyota Land Cruiser

1 Answer

Replacing a heater core in a 1994 olds. achieva.


  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.
0900c152800a93fc.jpgFig. 1: Unfasten the sound insulator retaining bolts ... 0900c152800a93fd.jpgFig. 2: ... 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.
0900c152800a93fe.jpgFig. 3: Remove the heater core access cover
  1. Unfasten the heater core mounting clamps/bolts, then extract the heater core from the vehicle.
0900c152800a93ff.jpgFig. 4: Unfasten the heater core retaining bolts; most later models are secured with clamps 0900c152800a9400.jpgFig. 5: Remove the heater core from the vehicleTo 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.6d0c523.jpg182943c.jpg164cdd5.jpg8032c04.jpg18be863.jpg

Oct 21, 2008 | 1994 Oldsmobile Achieva Special Edition

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